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PUSH-PULL PORTABLE TUBE AMPLIFIER
By ThomasH358 in CircuitsAudio
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INTRODUCTION: PUSH-PULL PORTABLE TUBE AMPLIFIER
By ThomasH358Follow
More by the author:
About: Started playing guitar but developed a serious taste for pedal and
amplifier building. Interested in smaller builds, for portability and lower
volume settings, mainly using vacuum tubes and older technologies … More About
ThomasH358 »
Inspired by my previous project, I decided to build a portable tube amplifier
that uses normal sized tubes, which are easily found in guitar stores (12AX7 and
12AU7). The power stage is based on my bluetooth tube amplifier, which delivers
about 1W of output power. For the preamp I choose a classic design, the OR120,
famous for its characteristic tones. Coincidentally, this amplifier also uses a
cathodyne phase inverter, which frees one extra triode for the preamp. Any other
preamplifier with 3 triode gain stages would also work.
This instructables will be structures as:
1. Circuit and schematic
2. Working on the enclosure and hardware assembly
3. Layout and circuit soldering
4. Voltage adjustment
5. Final result and Soundcheck
Disclaimer:
Although this is a small tube amplifier that works with only 10mA, it still
contain high voltages, up to 250 volts DC. Be careful! Do not touch the circuit
while the amplifier is turned on.
This is not a project for beginners! If you want to build this amplifier,
practice first with some lower voltage amplifier using the LM386, for example.
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SUPPLIES
This amplifier, as in previous cases, is powered by a 12V 2A wall wart and uses
a switched mode power supply (SMPS) to generate the 240V necessary for the
tubes. To keep things simple, I decided to use a ready to use SMPS board
available on ebay. Let's check the parts list:
Large parts
* 1x 12V to 250V, 20mA SMPS (15W SMPS)
* 1x 100V, 10W line transformer with 0.625W tap (I used this one)
* 2x 12AX7 (ECC83) tubes
* 1x 12AU7 (ECC82) tube
* 2x lug tag strips (7 or more lugs, use the smallest you can find with spacing
matching the distance between tubes sockets: I used this and this)
* 3x 9 pin tube sockets with centre shield (this one or similar)
* 1x Hammond 1590N1 or 125B (roughly 120 mm x 66 mm x 40 mm, 4.78" x 2.61" x
1.4")
* 2x Knobs (Diameter smaller than 20 mm)
* 2x mini Knobs (Diameter smaller than 15 mm)
Hardware
* 1x Mono or Stereo 1/4" jack with metal ferrule for grounding (input)
* 1x Mono or Stereo 1/4" jack with plastic screw, to avoid a ground loop
(output)
* 1x 2.1 mm mini DC jack
* 1x 1M Log (audio) (A1M) potentiometer (16 mm, metal shaft) - Gain
* 2x 1M Log (audio) (A1M) potentiometers (9 mm, metal shaft) - Treble, Bass
* 1x 1M Log (audio) (A1M) dual-gang potentiometer (16 mm, metal shaft) - Volume
* 1x 3 mm LED metal socket
* 1x mini SPDT (On On or On Off)
* 1x 5 pin header (like this one or this)
Circuit
* 1x 3 mm LED (any colour)
* 1x 4.7k resistor (LED resistor)
* 1x 1.4k 1/4W resistor (or close to this value) (R23)
* 1x 1.5k 1/4W resistor (R12)
* 1x 1.8k 1/4W resistor (R16)
* 2x 2.2k 1/4W resistors (R3, R8)
* 1x 6.2k 1/4W resistor (R26)
* 1x 15k 1/4W resistor (R24)
* 2x 22k 1/4W resistors (R6, R25)
* 3x 68k 1/4W resistors (R2, R17, R18)
* 8x 100k 1/4W resistors (R5, R7, R10, R13, R19, R20, R21, R22)
* 3x 220k 1/4W resistors (R4, R9, R11)
* 1x 470k 1/4W resistor (R14)
* 2x 1M 1/4W resistors (R1, R15)
* 1x 100 pF 50v capacitor (C7)
* 1x 330 pF 50v capacitor (C5)
* 1x 1 nF 50v capacitor (C6)
* 1x 1 nF 400v capacitor (the smallest you can find, 350v would also work)
(C10)
* 1x 2.2 nF 50v capacitor (C3)
* 1x 4.7 nF 400v capacitor (the smallest you can find, 350v would also work)
(C9)
* 1x 22 nF 50v capacitor (C4)
* 4x 64 nF 400v capacitors (the smallest you can find, 350v would also work)
(C2, C11, C12, C13)
* 1x 100 nF 400v capacitor (C17)
* 3x 10 uF 400v capacitors (the smallest you can find, 350v would also work)
(C15, C16, C18)
* 3x 47 uF 25v capacitors (C1, C8, C14)
Additional tools
* Soldering iron and solder
* Drill and drill bits (tube sockets are either 20 or 22 mm, Potentiometers are
6.5 mm, and so on)
* Sanding paper
* Clear coat
Additional parts needed for this amplifier to work:
* 12V DC wall wart
* Speaker cabinet with 8 ohms speaker
* Speaker cable
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STEP 1: CIRCUIT AND SCHEMATIC
The most complex part of the circuit and less forgiving is the power amplifier.
There you will have the highest voltages and currents, and we do not want to
melt your tubes (or valves) after just some hours. Since I used the same power
stage as in my previous instructables, we can go straight to the loadline, shown
in the first picture. It is much easier to design this stage using an online
loadline calculator.
With a 32k:8ohms transformer at 240 V bias is at -11.5 V, with a cathode current
of 2x4 mA (2 triodes in push-pull), which gives the 11.5 V/ 8 mA = 1.4 k
resistor and an output power of about 0.94 W.
Compared to the original design, which uses fixed bias at -47v (4 times our
bias), the lower bias will overdrive much earlier. To counter that, I added the
post phase inverter master volume, a grid-leak resistor of only 100k (R19, R20)
and grid stoppers (R21, R22). I also reduced the gain of the phase-inverter by
reducing the plate and cathode resistors to 68k (R17, R18). With the
post-phase-inverter volume control I can achieve both clean and highly distorted
levels (higher than in the original design). The 100k leak-resistors are also a
safety measure, in case the potentiometer goes bad.
In case someone wants to make it closer to the original amplifier and skip the
master volume control, adding a 300k resistor between C12 and R19 and C3 and R20
creates a voltage divider with the 100k grid-leak resistors. This results in the
desired signal reduction (1/4 of the original signal).
This amplifier also uses a negative feedback network, as in the original
amplifier. To achieve the 6 dB attenuation I measured the voltage amplitude of a
800 Hz sine wave at the output, with and without the feedback resistor. A value
of 6.2k (R26) resulted in the desired attenuation. If you want to make things
interesting, you can add a potentiometer and vary the resistance between 25k and
5k and hear how it changes the response of the amplifier.
The remaining part of the preamp was kept the same. The resulting schematic is
shown in the second picture.
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STEP 2: WORKING ON THE ENCLOSURE AND HARDWARE ASSEMBLY
2 More Images
Before we start drilling and sanding, let's do a little design planning...
The pedal enclosure used here has to fit all parts, including tubes and
transformer. The width of the front (side) limits the amount of controls one can
use here, unless they are in two rows, as in my previous build. Here I wanted to
keep some of the look of the original amplifier, and therefore I needed larger
knobs. To fit both tone controls I still used 9 mm potentiometers. A complete
tone stack (treble, middle, bass) would fit if at least the gain potentiometer
and knob were also smaller.
Another aesthetic choice was the positioning of the three tubes in a row. Not
only it gives more space in front of the tubes, it looks more what one would see
in a large amplifier. To make it even closer to the original I wanted to add a
large metal front plate that would also have the logo and hide the tubes. The
tubes will still be exposed from the back, though.
A drill template with the position of the components is shown in the first
picture of this section. I used real sized vectors of the parts to have an idea
of the size and end result. Notice, that the screws that hold the tube sockets
are not present. I always add them later, with the socket in position, so if I
made any mistake during the drilling of the socket holes the screws will still
be at the right position. The second image shows the box already done. For the
input jack and the LED socket's nut to fit I had to remove some material from
the inside of the enclosure (see red circle). A rotary tool will do the job
quite nicely. Do not forget to drill the holes for the output jack and the power
jack. They should be close to the side of the box where the transformer is
located, while the output jack should be about 30 mm from the outer edge so that
trimpot and capacitors of the SMPS board still fit.
Picture 4 shows the tube (valve) sockets in position. I also used the screws
that hold these sockets to hold the lug tag strips. See if you can find one that
matches the distance between the socket screws. Ideally it should be screwed at
2 positions. I drilled holes in one of them, so they would fit. Last picture
shows the transformer in position. Notice that I cut a small part of the
transformer, so that it is not longer than the width of the enclosure. The extra
supports are for the front plate, but they are not necessary in case you prefer
a design where the tubes are visible.
In my build I also added some etched symbols for the controls. If you are
interested, check steps 5, 6 and 7 here.
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STEP 3: LAYOUT AND CIRCUIT SOLDERING
The first picture shows the layout used for this build. It uses a point-to-point
approach, without a PCB or turret board. Before installing potentiometers and
jacks it is suggested that one installs the main circuitry first. The
positioning of the wires (lead dress) and grounding scheme play an important
role in keeping noises under control.
The steps are:
1. Solder heater wires (braided green and blue wires to pins 4 and 5 of all
tubes).
2. Solder ground wires (black wires) between tube centre lugs and the lug of
the terminal board.
3. Solder the resistors to the sockets. For lugs where there is more than one
only solder when both are in position.
4. Solder the coupling capacitors (in red).
5. Solder the electrolytic capacitors and bend them, so that they are laying
parallel to the back wall
6. Install the input jack. Add the 1M resistor directly to the jack. Add a
wire or component leg between the plastic and the enclosure while you screw
it in position. This will be the only connection of the ground to the
enclosure. It should be right at the input to reduce noise.
7. Solder the components and wires to the gain, treble and bass potentiometer
outside the box. To use the correct lengths and spacings insert the
potentiometers from the outside of the enclosure and solder in position. In
the end there should be 3 unconnected wires: ground (black), the input
(100k and 330pF legs) and the output (blue wire to the tube socket). For
the output use a shielded cable, and keep the connections to the 100k
resistor and 330pF capacitor as short as possible.
8. Mount the three potentiometers and solder the unconnected wires. The ground
wire should be connected to the input jack. This way it is closer to the
preamp's ground bus.
9. Solder the 5 wires to the volume potentiometer.
10. Mount the volume potentiometer and solder the wires to the correct lugs.
The ground wire should go to the central post at the 12AU7 tube socket, and
not the input!. This way it is closer to the power amplifier ground star.
11. Add the LED socket.
12. Solder the LED to the resistor. If possible insulate any exposed part with
heat-shrinking tubing.
13. Solder the LED and wires to the SPDT switch.
14. Add the SPDT and LED to the enclosure.
15. Solder the LED ground to the power star-ground.
16. Solder the wires to the transformer. 0 and 4 ohms on the secondary and 0W,
2.5W and 0.625W at the primary. If possible braid primary wires. Since this
amplifier works in push-pull the 0W wire carries the opposite signal of the
0.625W wire, reducing any sort of noise.
17. Solder the primary wires to the tube socket and to the high voltage node.
18. Solder the secondary wires to the output jack.
19. Ground the sleeve of the output jack (power ground).
20. Add the feedback resistor directly to the output jack and a wire to the
correct socket pin (purple wire).
21. Solder wires to the DC jack, according to the wall wart you are using
(centre negative or positive). The layout shows the connection when using a
12v pedal power supply. I used a normal 12v power supply (centre positive)
22. Mount the DC jack to the enclosure and solder the wires to the SPDT and to
the power ground.
23. Solder the wires to the 5 (or 6) pin connector (header) following the
sequence shown on the SMPS board. In my case I left the EN pin unconnected
and only used one of the GND connections, since both were already
connected.
24. Connect the SMPS board. I soldered my connector, so that it is located
close to the lateral of the enclosure, with trimpot and large capacitors
above the DC jack.
The second and third images show the assembly with and without the SMPS board.
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STEP 4: VOLTAGE ADJUSTMENT
Before turning the amplifier on it is a good idea to check if parts of the
circuit are working correctly.
1. Without the SMPS connect the 12v supply and turn the amplifier, with the
tubes (valves) in position. The LED should light up and the filament of the
tubes should glow.
2. To verify the SMPS and adjust the output voltage we need to add the 12v and
GND connections to a DC jack. To ensure it will work at the desired load
240v/10mA= 24k, add a 24k resistor between HV and GND and connect the SMPS
to the 12v wall wart. With a multimeter measure the voltage between GND and
HV. Adjust the trimpot until the measured voltage is at 240v. If this
adjustment is done without the load, the voltage will drop a little once
there is a load. This way we can ensure the correct voltage when under load.
3. Unsolder or disconnect the DC jack and load resistor from the SMPS and
connect the SMPS to the connector in the amplifier with the amplifier turned
off.
4. Before turning the amplifier on, prepare your multimeter to measure the
voltage at the high voltage node in the amplifier (transformer's centre tap
or at the 15k resistor).
5. Connect the speaker to the output.
6. Turn the amplifier on and check the voltage. It should be around 240v and
can drop a little while the tubes heat up.
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STEP 5: FINAL RESULT AND SOUNDCHECK
2 More Images
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10 COMMENTS
0
KeriSzafir
8 days ago
ReplyUpvote
Impressive! It's so cool how you crammed it all into such a teeny tiny
enclosure.
0
mrgeorgemartyn
9 days ago
ReplyUpvote
May be use this output transformer - not very fine idea.
Windings,number :
725+300+400+600+900
48+18+30
you have 1 425 on push and 1 500 on pull side.
1 reply
0
ThomasH358mrgeorgemartyn
Reply 8 days ago
ReplyUpvote
For guitar and on a budget it is quite good. The goal is distortion, not HIFI.
There is also a difference between wire gauges for each power rating, which also
affects the balance of the output stage, and may be even more influential than
the number of turns.
0
an79881
8 days ago
ReplyUpvote
Hallo, i like this project! Is the amplifier for Electric Guitar only or can ist
be Used as normal amplifier? What is the expected frequency range (-3dB)?
Furthermore I do not understand the purpose of the stereopoti in the power
stage? Could you explain this briefly?
Regards Andreas
1 reply
0
ThomasH358an79881
Reply 8 days ago
ReplyUpvote
It can be adapted to be used as a normal amplifier. For normal audio there is no
need for all the gain available, and one stage could easily be dropped. Maybe
even a whole tube.
The stereo-potentiometer works as a post-phase-inverter master volume. This way,
there is some additional distortion from the phase inverter. If the master
volume is before the PI there are less stages to shape the distortion.
0
CraigH6
9 days ago
ReplyUpvote
Excellent project. Have a few questions. Did you have oscillation problems,
hence you added C10? Is this because the switcher was running at 120KHz?
Checking out your other posts as well. Thanks for the write up.
1 reply
0
ThomasH358CraigH6
Reply 9 days ago
ReplyUpvote
C10 is part of the preamp circuit I used. In the original amplifier it probably
was added for this purpose.
0
Build_it_Bob
9 days ago
ReplyUpvote
Hi Thomas, beautiful design and implementation.
You have a nice array of tube projects.. Thank you for sharing your creations!
Bob D
0
squachbass
11 days ago
ReplyUpvote
Thanks for sharing and the most excellent write up.. I actually ordered a 20$
preamp board from eBay today, my plan is to use or was to use to make a tube
preamp stomp box/peddle and gift it to my brother for his birthday.. I’ve pretty
much got a solid plan minus the mesa boogie tone stack which I’ve not even
started to research yet.. Surly afterwards this is a nex project for another one
them skinny string thing player an Bandmate🤫
0
Palingenesis
17 days ago
ReplyUpvote
Very nice.
Bring back the 70's Bang a Gong :)
Post Comment
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NO
CUSTOMIZE YOUR ADVERTISING – PERMITS US TO OFFER TARGETED ADVERTISING TO YOU
These cookies collect data about you based on your activities and interests in
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STRICTLY NECESSARY – REQUIRED FOR OUR SITE TO WORK AND TO PROVIDE SERVICES TO
YOU
Qualtrics
We use Qualtrics to let you give us feedback via surveys or online forms. You
may be randomly selected to participate in a survey, or you can actively decide
to give us feedback. We collect data to better understand what actions you took
before filling out a survey. This helps us troubleshoot issues you may have
experienced. Qualtrics Privacy Policy
Akamai mPulse
We use Akamai mPulse to collect data about your behavior on our sites. This may
include pages you’ve visited, trials you’ve initiated, videos you’ve played,
purchases you’ve made, your IP address or device ID, and your Autodesk ID. We
use this data to measure our site performance and evaluate the ease of your
online experience, so we can enhance our features. We also use advanced
analytics methods to optimize your experience with email, customer support, and
sales. Akamai mPulse Privacy Policy
Digital River
We use Digital River to collect data about your behavior on our sites. This may
include pages you’ve visited, trials you’ve initiated, videos you’ve played,
purchases you’ve made, your IP address or device ID, and your Autodesk ID. We
use this data to measure our site performance and evaluate the ease of your
online experience, so we can enhance our features. We also use advanced
analytics methods to optimize your experience with email, customer support, and
sales. Digital River Privacy Policy
Dynatrace
We use Dynatrace to collect data about your behavior on our sites. This may
include pages you’ve visited, trials you’ve initiated, videos you’ve played,
purchases you’ve made, your IP address or device ID, and your Autodesk ID. We
use this data to measure our site performance and evaluate the ease of your
online experience, so we can enhance our features. We also use advanced
analytics methods to optimize your experience with email, customer support, and
sales. Dynatrace Privacy Policy
Khoros
We use Khoros to collect data about your behavior on our sites. This may include
pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases
you’ve made, your IP address or device ID, and your Autodesk ID. We use this
data to measure our site performance and evaluate the ease of your online
experience, so we can enhance our features. We also use advanced analytics
methods to optimize your experience with email, customer support, and sales.
Khoros Privacy Policy
Launch Darkly
We use Launch Darkly to collect data about your behavior on our sites. This may
include pages you’ve visited, trials you’ve initiated, videos you’ve played,
purchases you’ve made, your IP address or device ID, and your Autodesk ID. We
use this data to measure our site performance and evaluate the ease of your
online experience, so we can enhance our features. We also use advanced
analytics methods to optimize your experience with email, customer support, and
sales. Launch Darkly Privacy Policy
New Relic
We use New Relic to collect data about your behavior on our sites. This may
include pages you’ve visited, trials you’ve initiated, videos you’ve played,
purchases you’ve made, your IP address or device ID, and your Autodesk ID. We
use this data to measure our site performance and evaluate the ease of your
online experience, so we can enhance our features. We also use advanced
analytics methods to optimize your experience with email, customer support, and
sales. New Relic Privacy Policy
Salesforce Live Agent
We use Salesforce Live Agent to collect data about your behavior on our sites.
This may include pages you’ve visited, trials you’ve initiated, videos you’ve
played, purchases you’ve made, your IP address or device ID, and your Autodesk
ID. We use this data to measure our site performance and evaluate the ease of
your online experience, so we can enhance our features. We also use advanced
analytics methods to optimize your experience with email, customer support, and
sales. Salesforce Live Agent Privacy Policy
Wistia
We use Wistia to collect data about your behavior on our sites. This may include
pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases
you’ve made, your IP address or device ID, and your Autodesk ID. We use this
data to measure our site performance and evaluate the ease of your online
experience, so we can enhance our features. We also use advanced analytics
methods to optimize your experience with email, customer support, and sales.
Wistia Privacy Policy
Tealium
We use Tealium to collect data about your behavior on our sites. This may
include pages you’ve visited, trials you’ve initiated, videos you’ve played,
purchases you’ve made, and your IP address or device ID. We use this data to
measure our site performance and evaluate the ease of your online experience, so
we can enhance our features. We also use advanced analytics methods to optimize
your experience with email, customer support, and sales. Tealium Privacy Policy
Upsellit
We use Upsellit to collect data about your behavior on our sites. This may
include pages you’ve visited, trials you’ve initiated, videos you’ve played,
purchases you’ve made, and your IP address or device ID. We use this data to
measure our site performance and evaluate the ease of your online experience, so
we can enhance our features. We also use advanced analytics methods to optimize
your experience with email, customer support, and sales. Upsellit Privacy Policy
CJ Affiliates
We use CJ Affiliates to collect data about your behavior on our sites. This may
include pages you’ve visited, trials you’ve initiated, videos you’ve played,
purchases you’ve made, and your IP address or device ID. We use this data to
measure our site performance and evaluate the ease of your online experience, so
we can enhance our features. We also use advanced analytics methods to optimize
your experience with email, customer support, and sales. CJ Affiliates Privacy
Policy
Commission Factory
We use Commission Factory to collect data about your behavior on our sites. This
may include pages you’ve visited, trials you’ve initiated, videos you’ve played,
purchases you’ve made, and your IP address or device ID. We use this data to
measure our site performance and evaluate the ease of your online experience, so
we can enhance our features. We also use advanced analytics methods to optimize
your experience with email, customer support, and sales. Commission Factory
Privacy Policy
Google Analytics (Strictly Necessary)
We use Google Analytics (Strictly Necessary) to collect data about your behavior
on our sites. This may include pages you’ve visited, trials you’ve initiated,
videos you’ve played, purchases you’ve made, your IP address or device ID, and
your Autodesk ID. We use this data to measure our site performance and evaluate
the ease of your online experience, so we can enhance our features. We also use
advanced analytics methods to optimize your experience with email, customer
support, and sales. Google Analytics (Strictly Necessary) Privacy Policy
Typepad Stats
We use Typepad Stats to collect data about your behaviour on our sites. This may
include pages you’ve visited. We use this data to measure our site performance
and evaluate the ease of your online experience, so we can enhance our platform
to provide the most relevant content. This allows us to enhance your overall
user experience. Typepad Stats Privacy Policy
Geo Targetly
We use Geo Targetly to direct website visitors to the most appropriate web page
and/or serve tailored content based on their location. Geo Targetly uses the IP
address of a website visitor to determine the approximate location of the
visitor’s device. This helps ensure that the visitor views content in their
(most likely) local language.Geo Targetly Privacy Policy
SpeedCurve
We use SpeedCurve to monitor and measure the performance of your website
experience by measuring web page load times as well as the responsiveness of
subsequent elements such as images, scripts, and text.SpeedCurve Privacy Policy
Qualified
Qualified is the Autodesk Live Chat agent platform. This platform provides
services to allow our customers to communicate in real-time with Autodesk
support. We may collect unique ID for specific browser sessions during a chat.
Qualified Privacy Policy
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Google Optimize
We use Google Optimize to test new features on our sites and customize your
experience of these features. To do this, we collect behavioral data while
you’re on our sites. This data may include pages you’ve visited, trials you’ve
initiated, videos you’ve played, purchases you’ve made, your IP address or
device ID, your Autodesk ID, and others. You may experience a different version
of our sites based on feature testing, or view personalized content based on
your visitor attributes. Google Optimize Privacy Policy
ClickTale
We use ClickTale to better understand where you may encounter difficulties with
our sites. We use session recording to help us see how you interact with our
sites, including any elements on our pages. Your Personally Identifiable
Information is masked and is not collected. ClickTale Privacy Policy
OneSignal
We use OneSignal to deploy digital advertising on sites supported by OneSignal.
Ads are based on both OneSignal data and behavioral data that we collect while
you’re on our sites. The data we collect may include pages you’ve visited,
trials you’ve initiated, videos you’ve played, purchases you’ve made, and your
IP address or device ID. This information may be combined with data that
OneSignal has collected from you. We use the data that we provide to OneSignal
to better customize your digital advertising experience and present you with
more relevant ads. OneSignal Privacy Policy
Optimizely
We use Optimizely to test new features on our sites and customize your
experience of these features. To do this, we collect behavioral data while
you’re on our sites. This data may include pages you’ve visited, trials you’ve
initiated, videos you’ve played, purchases you’ve made, your IP address or
device ID, your Autodesk ID, and others. You may experience a different version
of our sites based on feature testing, or view personalized content based on
your visitor attributes. Optimizely Privacy Policy
Amplitude
We use Amplitude to test new features on our sites and customize your experience
of these features. To do this, we collect behavioral data while you’re on our
sites. This data may include pages you’ve visited, trials you’ve initiated,
videos you’ve played, purchases you’ve made, your IP address or device ID, your
Autodesk ID, and others. You may experience a different version of our sites
based on feature testing, or view personalized content based on your visitor
attributes. Amplitude Privacy Policy
Snowplow
We use Snowplow to collect data about your behavior on our sites. This may
include pages you’ve visited, trials you’ve initiated, videos you’ve played,
purchases you’ve made, your IP address or device ID, and your Autodesk ID. We
use this data to measure our site performance and evaluate the ease of your
online experience, so we can enhance our features. We also use advanced
analytics methods to optimize your experience with email, customer support, and
sales. Snowplow Privacy Policy
UserVoice
We use UserVoice to collect data about your behaviour on our sites. This may
include pages you’ve visited. We use this data to measure our site performance
and evaluate the ease of your online experience, so we can enhance our platform
to provide the most relevant content. This allows us to enhance your overall
user experience. UserVoice Privacy Policy
Clearbit
Clearbit allows real-time data enrichment to provide a personalized and relevant
experience to our customers. The data we collect may include pages you’ve
visited, trials you’ve initiated, videos you’ve played, purchases you’ve made,
and your IP address or device ID.Clearbit Privacy Policy
YouTube
YouTube is a video sharing platform which allows users to view and share
embedded videos on our websites. YouTube provides viewership metrics on video
performance. YouTube Privacy Policy
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Adobe Analytics
We use Adobe Analytics to collect data about your behavior on our sites. This
may include pages you’ve visited, trials you’ve initiated, videos you’ve played,
purchases you’ve made, your IP address or device ID, and your Autodesk ID. We
use this data to measure our site performance and evaluate the ease of your
online experience, so we can enhance our features. We also use advanced
analytics methods to optimize your experience with email, customer support, and
sales. Adobe Analytics Privacy Policy
Google Analytics (Web Analytics)
We use Google Analytics (Web Analytics) to collect data about your behavior on
our sites. This may include pages you’ve visited, trials you’ve initiated,
videos you’ve played, purchases you’ve made, and your IP address or device ID.
We use this data to measure our site performance and evaluate the ease of your
online experience, so we can enhance our features. We also use advanced
analytics methods to optimize your experience with email, customer support, and
sales. Google Analytics (Web Analytics) Privacy Policy
AdWords
We use AdWords to deploy digital advertising on sites supported by AdWords. Ads
are based on both AdWords data and behavioral data that we collect while you’re
on our sites. The data we collect may include pages you’ve visited, trials
you’ve initiated, videos you’ve played, purchases you’ve made, and your IP
address or device ID. This information may be combined with data that AdWords
has collected from you. We use the data that we provide to AdWords to better
customize your digital advertising experience and present you with more relevant
ads. AdWords Privacy Policy
Marketo
We use Marketo to send you more timely and relevant email content. To do this,
we collect data about your online behavior and your interaction with the emails
we send. Data collected may include pages you’ve visited, trials you’ve
initiated, videos you’ve played, purchases you’ve made, your IP address or
device ID, email open rates, links clicked, and others. We may combine this data
with data collected from other sources to offer you improved sales or customer
service experiences, as well as more relevant content based on advanced
analytics processing. Marketo Privacy Policy
Doubleclick
We use Doubleclick to deploy digital advertising on sites supported by
Doubleclick. Ads are based on both Doubleclick data and behavioral data that we
collect while you’re on our sites. The data we collect may include pages you’ve
visited, trials you’ve initiated, videos you’ve played, purchases you’ve made,
and your IP address or device ID. This information may be combined with data
that Doubleclick has collected from you. We use the data that we provide to
Doubleclick to better customize your digital advertising experience and present
you with more relevant ads. Doubleclick Privacy Policy
HubSpot
We use HubSpot to send you more timely and relevant email content. To do this,
we collect data about your online behavior and your interaction with the emails
we send. Data collected may include pages you’ve visited, trials you’ve
initiated, videos you’ve played, purchases you’ve made, your IP address or
device ID, email open rates, links clicked, and others. HubSpot Privacy Policy
Twitter
We use Twitter to deploy digital advertising on sites supported by Twitter. Ads
are based on both Twitter data and behavioral data that we collect while you’re
on our sites. The data we collect may include pages you’ve visited, trials
you’ve initiated, videos you’ve played, purchases you’ve made, and your IP
address or device ID. This information may be combined with data that Twitter
has collected from you. We use the data that we provide to Twitter to better
customize your digital advertising experience and present you with more relevant
ads. Twitter Privacy Policy
Facebook
We use Facebook to deploy digital advertising on sites supported by Facebook.
Ads are based on both Facebook data and behavioral data that we collect while
you’re on our sites. The data we collect may include pages you’ve visited,
trials you’ve initiated, videos you’ve played, purchases you’ve made, and your
IP address or device ID. This information may be combined with data that
Facebook has collected from you. We use the data that we provide to Facebook to
better customize your digital advertising experience and present you with more
relevant ads. Facebook Privacy Policy
LinkedIn
We use LinkedIn to deploy digital advertising on sites supported by LinkedIn.
Ads are based on both LinkedIn data and behavioral data that we collect while
you’re on our sites. The data we collect may include pages you’ve visited,
trials you’ve initiated, videos you’ve played, purchases you’ve made, and your
IP address or device ID. This information may be combined with data that
LinkedIn has collected from you. We use the data that we provide to LinkedIn to
better customize your digital advertising experience and present you with more
relevant ads. LinkedIn Privacy Policy
Yahoo! Japan
We use Yahoo! Japan to deploy digital advertising on sites supported by Yahoo!
Japan. Ads are based on both Yahoo! Japan data and behavioral data that we
collect while you’re on our sites. The data we collect may include pages you’ve
visited, trials you’ve initiated, videos you’ve played, purchases you’ve made,
and your IP address or device ID. This information may be combined with data
that Yahoo! Japan has collected from you. We use the data that we provide to
Yahoo! Japan to better customize your digital advertising experience and present
you with more relevant ads. Yahoo! Japan Privacy Policy
Naver
We use Naver to deploy digital advertising on sites supported by Naver. Ads are
based on both Naver data and behavioral data that we collect while you’re on our
sites. The data we collect may include pages you’ve visited, trials you’ve
initiated, videos you’ve played, purchases you’ve made, and your IP address or
device ID. This information may be combined with data that Naver has collected
from you. We use the data that we provide to Naver to better customize your
digital advertising experience and present you with more relevant ads. Naver
Privacy Policy
Quantcast
We use Quantcast to deploy digital advertising on sites supported by Quantcast.
Ads are based on both Quantcast data and behavioral data that we collect while
you’re on our sites. The data we collect may include pages you’ve visited,
trials you’ve initiated, videos you’ve played, purchases you’ve made, and your
IP address or device ID. This information may be combined with data that
Quantcast has collected from you. We use the data that we provide to Quantcast
to better customize your digital advertising experience and present you with
more relevant ads. Quantcast Privacy Policy
Call Tracking
We use Call Tracking to provide customized phone numbers for our campaigns. This
gives you faster access to our agents and helps us more accurately evaluate our
performance. We may collect data about your behavior on our sites based on the
phone number provided. Call Tracking Privacy Policy
Wunderkind
We use Wunderkind to deploy digital advertising on sites supported by
Wunderkind. Ads are based on both Wunderkind data and behavioral data that we
collect while you’re on our sites. The data we collect may include pages you’ve
visited, trials you’ve initiated, videos you’ve played, purchases you’ve made,
and your IP address or device ID. This information may be combined with data
that Wunderkind has collected from you. We use the data that we provide to
Wunderkind to better customize your digital advertising experience and present
you with more relevant ads. Wunderkind Privacy Policy
ADC Media
We use ADC Media to deploy digital advertising on sites supported by ADC Media.
Ads are based on both ADC Media data and behavioral data that we collect while
you’re on our sites. The data we collect may include pages you’ve visited,
trials you’ve initiated, videos you’ve played, purchases you’ve made, and your
IP address or device ID. This information may be combined with data that ADC
Media has collected from you. We use the data that we provide to ADC Media to
better customize your digital advertising experience and present you with more
relevant ads. ADC Media Privacy Policy
AgrantSEM
We use AgrantSEM to deploy digital advertising on sites supported by AgrantSEM.
Ads are based on both AgrantSEM data and behavioral data that we collect while
you’re on our sites. The data we collect may include pages you’ve visited,
trials you’ve initiated, videos you’ve played, purchases you’ve made, and your
IP address or device ID. This information may be combined with data that
AgrantSEM has collected from you. We use the data that we provide to AgrantSEM
to better customize your digital advertising experience and present you with
more relevant ads. AgrantSEM Privacy Policy
Bidtellect
We use Bidtellect to deploy digital advertising on sites supported by
Bidtellect. Ads are based on both Bidtellect data and behavioral data that we
collect while you’re on our sites. The data we collect may include pages you’ve
visited, trials you’ve initiated, videos you’ve played, purchases you’ve made,
and your IP address or device ID. This information may be combined with data
that Bidtellect has collected from you. We use the data that we provide to
Bidtellect to better customize your digital advertising experience and present
you with more relevant ads. Bidtellect Privacy Policy
Bing
We use Bing to deploy digital advertising on sites supported by Bing. Ads are
based on both Bing data and behavioral data that we collect while you’re on our
sites. The data we collect may include pages you’ve visited, trials you’ve
initiated, videos you’ve played, purchases you’ve made, and your IP address or
device ID. This information may be combined with data that Bing has collected
from you. We use the data that we provide to Bing to better customize your
digital advertising experience and present you with more relevant ads. Bing
Privacy Policy
G2Crowd
We use G2Crowd to deploy digital advertising on sites supported by G2Crowd. Ads
are based on both G2Crowd data and behavioral data that we collect while you’re
on our sites. The data we collect may include pages you’ve visited, trials
you’ve initiated, videos you’ve played, purchases you’ve made, and your IP
address or device ID. This information may be combined with data that G2Crowd
has collected from you. We use the data that we provide to G2Crowd to better
customize your digital advertising experience and present you with more relevant
ads. G2Crowd Privacy Policy
NMPI Display
We use NMPI Display to deploy digital advertising on sites supported by NMPI
Display. Ads are based on both NMPI Display data and behavioral data that we
collect while you’re on our sites. The data we collect may include pages you’ve
visited, trials you’ve initiated, videos you’ve played, purchases you’ve made,
and your IP address or device ID. This information may be combined with data
that NMPI Display has collected from you. We use the data that we provide to
NMPI Display to better customize your digital advertising experience and present
you with more relevant ads. NMPI Display Privacy Policy
VK
We use VK to deploy digital advertising on sites supported by VK. Ads are based
on both VK data and behavioral data that we collect while you’re on our sites.
The data we collect may include pages you’ve visited, trials you’ve initiated,
videos you’ve played, purchases you’ve made, and your IP address or device ID.
This information may be combined with data that VK has collected from you. We
use the data that we provide to VK to better customize your digital advertising
experience and present you with more relevant ads. VK Privacy Policy
Adobe Target
We use Adobe Target to test new features on our sites and customize your
experience of these features. To do this, we collect behavioral data while
you’re on our sites. This data may include pages you’ve visited, trials you’ve
initiated, videos you’ve played, purchases you’ve made, your IP address or
device ID, your Autodesk ID, and others. You may experience a different version
of our sites based on feature testing, or view personalized content based on
your visitor attributes. Adobe Target Privacy Policy
Google Analytics (Advertising)
We use Google Analytics (Advertising) to deploy digital advertising on sites
supported by Google Analytics (Advertising). Ads are based on both Google
Analytics (Advertising) data and behavioral data that we collect while you’re on
our sites. The data we collect may include pages you’ve visited, trials you’ve
initiated, videos you’ve played, purchases you’ve made, and your IP address or
device ID. This information may be combined with data that Google Analytics
(Advertising) has collected from you. We use the data that we provide to Google
Analytics (Advertising) to better customize your digital advertising experience
and present you with more relevant ads. Google Analytics (Advertising) Privacy
Policy
Trendkite
We use Trendkite to deploy digital advertising on sites supported by Trendkite.
Ads are based on both Trendkite data and behavioral data that we collect while
you’re on our sites. The data we collect may include pages you’ve visited,
trials you’ve initiated, videos you’ve played, purchases you’ve made, and your
IP address or device ID. This information may be combined with data that
Trendkite has collected from you. We use the data that we provide to Trendkite
to better customize your digital advertising experience and present you with
more relevant ads. Trendkite Privacy Policy
Hotjar
We use Hotjar to deploy digital advertising on sites supported by Hotjar. Ads
are based on both Hotjar data and behavioral data that we collect while you’re
on our sites. The data we collect may include pages you’ve visited, trials
you’ve initiated, videos you’ve played, purchases you’ve made, and your IP
address or device ID. This information may be combined with data that Hotjar has
collected from you. We use the data that we provide to Hotjar to better
customize your digital advertising experience and present you with more relevant
ads. Hotjar Privacy Policy
6 Sense
We use 6 Sense to deploy digital advertising on sites supported by 6 Sense. Ads
are based on both 6 Sense data and behavioral data that we collect while you’re
on our sites. The data we collect may include pages you’ve visited, trials
you’ve initiated, videos you’ve played, purchases you’ve made, and your IP
address or device ID. This information may be combined with data that 6 Sense
has collected from you. We use the data that we provide to 6 Sense to better
customize your digital advertising experience and present you with more relevant
ads. 6 Sense Privacy Policy
Terminus
We use Terminus to deploy digital advertising on sites supported by Terminus.
Ads are based on both Terminus data and behavioral data that we collect while
you’re on our sites. The data we collect may include pages you’ve visited,
trials you’ve initiated, videos you’ve played, purchases you’ve made, and your
IP address or device ID. This information may be combined with data that
Terminus has collected from you. We use the data that we provide to Terminus to
better customize your digital advertising experience and present you with more
relevant ads. Terminus Privacy Policy
StackAdapt
We use StackAdapt to deploy digital advertising on sites supported by
StackAdapt. Ads are based on both StackAdapt data and behavioral data that we
collect while you’re on our sites. The data we collect may include pages you’ve
visited, trials you’ve initiated, videos you’ve played, purchases you’ve made,
and your IP address or device ID. This information may be combined with data
that StackAdapt has collected from you. We use the data that we provide to
StackAdapt to better customize your digital advertising experience and present
you with more relevant ads. StackAdapt Privacy Policy
The Trade Desk
We use The Trade Desk to deploy digital advertising on sites supported by The
Trade Desk. Ads are based on both The Trade Desk data and behavioral data that
we collect while you’re on our sites. The data we collect may include pages
you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve
made, and your IP address or device ID. This information may be combined with
data that The Trade Desk has collected from you. We use the data that we provide
to The Trade Desk to better customize your digital advertising experience and
present you with more relevant ads. The Trade Desk Privacy Policy
RollWorks
We use RollWorks to deploy digital advertising on sites supported by RollWorks.
Ads are based on both RollWorks data and behavioral data that we collect while
you’re on our sites. The data we collect may include pages you’ve visited,
trials you’ve initiated, videos you’ve played, purchases you’ve made, and your
IP address or device ID. This information may be combined with data that
RollWorks has collected from you. We use the data that we provide to RollWorks
to better customize your digital advertising experience and present you with
more relevant ads. RollWorks Privacy Policy
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We care about your privacy. The data we collect helps us understand how you use
our products, what information you might be interested in, and what we can
improve to make your engagement with Autodesk more rewarding.
May we collect and use your data to tailor your experience?
Explore the benefits of a customized experience by managing your privacy
settings for this site or visit our Privacy Statement to learn more about your
options.
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