Monday, 2 November 2015

Tech 21 SansAmp GT2








38 comments:

  1. This with the classic and much more on the to build list will keep me busy until 2017 !
    Thanks Alex for another very well put layout :-)

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  2. Which is the value of that resistor "CLR"?

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    1. Whatever suits you when it comes to LED brightness. I tend to use something between 2K and 4K7 depending on the LED type

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  3. Should add tags: Amp Emulation, Distortion, Tech21, Unverified, Vero

    Just realized I couldn't search this one under any tags.

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  4. How do u wire the switches up like the top left corner sw3 b2b3 hope this is not a dumd question

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    1. Each of the 3 switches has 8 connectors : A, A1, A2, A3, B, B1, B2, B3 (A and B being the poles and the 6 others the throws, ie 2P3T, 2 poles / 3 throws for each pole)
      In that case you have to connect a wire to switch 3 B2 and B3
      It's that simple ;-)

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  5. Are the one below sw3b2b3 sw3b are sw3 a1a3

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  6. Dammit, I don't need another complex build. Now I'm never going to sleep!

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  7. Dammit, I don't need another complex build. Now I'm never going to sleep!

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  9. Replies
    1. Thanks Luca!
      I've missed one!
      I've updated it.

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    2. Started building this beast \m/
      https://www.facebook.com/media/set/?set=a.761219917340583.1073741862.652892171506692&type=3

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    3. Looks great so far, I like the way you wired the switches on pieces of perfboards

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    4. I've done it 'cause it will be easier to install them

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  10. Thank's for posting ! Looks awesome !
    is it a transistor on CBE ? and if so, what reference do you suggest ?

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  11. It's a 2n5088.
    It's written on the layout.

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  12. Ha !!! Sorry, I should have seen it !

    Thanks for the reply anyway

    Stéphane

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  13. Has anyone verified this yet i built it i'm getting sound through it but with the volume turned all the way up i can hardly hear it i have checked everything cant find anything wrong.

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    1. no it's not verified. you could be the one!
      i've also checked the layout and i believe it matches with the schematic.
      if you haven't fixed it yet, you can post your voltages and some clear photos of both sides of your board, in the forum at debugging section.

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  14. how to make an independent switch for each gain mode?

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  15. I'm building one. So far it works (i.e: there’s a overdriven sound when pluged), but with a screeching noise when the high potti is fully open. But I still wait for the 3 2P3T sliding switches. In the meanwhile, I’ve tried to bypass them with jumpers, but maybe the problem comes from that :)
    I’ll post back when I’ll have the switches installed.


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  16. Any video of the clone sounds? It would be great to hear the similarities :)

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  18. Is the 'CLR' component the resistor that usually goes between the 9v jack and the on/off LED?

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    1. correct. CLR stands for current limiting resistor, so any time you see it it's going to the LED.

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  19. The 'California/Hot Wired/Off Axis' route is the best.
    Is there a build on this site that emulates just that sound?

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  20. Did you build this one?
    You could just remove the switches and just keep the components you need for those settings.

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  21. Neat. Two questions: 1. On the layout at Column 15 Track 6 does the blue ring on the link mean that two links connect to the track at that point ? 2. Is Pin 1 of the IC's at top left ? Thanks

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    1. Yes for both (as far as the IC orientation is with the dot upwards like here)

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  22. Hello,
    Just to share my accomplishment... I've finally finished this build. It was my first without a kit. The GT2 clone works perfectly well. I can't remember if the tone is comparable to the original, but this build sounds great with my Jazz bass. Thank’s for your site !

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