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My God! What have I done?

Discussion in 'Shock Brother's DIY Amps' started by shortcircuit, Nov 4, 2019.

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  1. Nov 4, 2019 #1
    shortcircuit

    shortcircuit Tele-Meister

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    Source Follower.jpg

    Silicon poisoning.
     
    Fretting out, Pasta Player, Skydog1010 and 6 others like this.
  2. Nov 4, 2019 #2
    Paulie_Boy

    Paulie_Boy Tele-Meister

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    Cut the blue wire. NO..WAIT..CUT THE RED WIRE!
     
    Shuster, Skydog1010, Tommyd55 and 10 others like this.
  3. Nov 4, 2019 #3
    Preacher

    Preacher Friend of Leo's

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    Man I would love to do point to point, but I get confused too easily.

    That looks nice and tidy for a point to point too!
     
    tubedood likes this.
  4. Nov 4, 2019 #4
    Mexitele Blues

    Mexitele Blues Tele-Holic

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    You may ask yourself, "Am I right or am I wrong?"

    Are we voting for more hi res pics of shortcircuit amps? I vote yea.
     
    Skydog1010, Deathray, tubedood and 1 other person like this.
  5. Nov 4, 2019 #5
    charlie chitlin

    charlie chitlin Doctor of Teleocity Silver Supporter

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    'At's a nice-a spaghetti!
     
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  6. Nov 4, 2019 #6
    Nickfl

    Nickfl Tele-Afflicted

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    What indeed... I see it but I can't tell what its up to. Cathode follower, tremolo oscillator, surely not a gain stage?! :eek:
     
  7. Nov 4, 2019 #7
    printer2

    printer2 Poster Extraordinaire

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    Put some shrink wrap over it, no one will know.
     
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  8. Nov 4, 2019 #8
    shortcircuit

    shortcircuit Tele-Meister

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    Heck no! I don't eat babies! It's a sources follower to drive a tone stack. I redid my big amp to a high gain circuit. The old cathode follower is now a gain stage. I'll post the details when I get home tonight.
     
  9. Nov 4, 2019 #9
    sds1

    sds1 Tele-Afflicted

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    Properly heatsinked to chassis, I don't see any problem here.
     
    Tommyd55 likes this.
  10. Nov 4, 2019 #10
    GoldDeluxe5E3

    GoldDeluxe5E3 Tele-Afflicted Silver Supporter

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    Hey, wait a minute. This is not an amp. This is the bottom of your Smart Blender, isn't it?
     
    Fretting out, The Angry Possum and nojazzhere like this.
  11. Nov 4, 2019 #11
    bcorig

    bcorig Tele-Afflicted Silver Supporter

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    KWal likes this.
  12. Nov 4, 2019 #12
    nojazzhere

    nojazzhere Doctor of Teleocity

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    Juggernaut,,,,right?
     
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  13. Nov 4, 2019 #13
    shortcircuit

    shortcircuit Tele-Meister

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    Here's the full guts.

    Innards.jpg

    ABnormal763.png

    Again, this is a rework of a build from last year. The only thing this amp has anything to do with an AB763 circuit is the 12AT7 phase inverter. It's center biased, unlike Fender which is biased quite hot. The first stage is a 12AU7 cascode, ripped off from Merlin. I have a bunch of 12AU7's and wanted to find a use for them in a guitar amp. It used to have a regular cathode follower driving the tone stack (ripped off from 5F8-A, but with a 470pF cap for a bit more mids), but I rewired it as an extra gain stage cold clipper going into a hot gain stage à la JCM800. The impedance of the output transformer is 3,300 Ohm, thus, the EL34 power tubes. I should rename the amp to Chimera, or something like that, but I feel keeping a reference to the AB763 circuit will offend more folks.:D
     
    Last edited: Nov 5, 2019
    tubelectron likes this.
  14. Nov 5, 2019 #14
    cyclopean

    cyclopean Friend of Leo's

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    this is not my beautiful house!
     
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  15. Nov 5, 2019 #15
    edvard

    edvard Tele-Afflicted

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    I noticed immediately and thought "I betcha that's a source follower in front of a tone stack". o_O

    No shame in that, as all it does is pass the signal on through while protecting the preceding stage from tone-sucking. You can also wire a MOS transistor as a constant-current source to replace that cascode bit, and you've got yerself another triode to abuse!

    Love the name, by the way :lol:

     
  16. Nov 5, 2019 #16
    gusfinley

    gusfinley Tele-Holic

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    Nice "NASA" splicing!
     
  17. Nov 5, 2019 #17
    KT89

    KT89 Tele-Meister

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    For a minute there I was concerned you had introduced evil silicon to a signal path uncorrupted by any sort of non-tube amplification. Good thing there are no effects with semiconductors in them or all our tube amps will sound like Line 6 Spiders Please don't crucify me I built my amp with a switching power supply
     
  18. Nov 5, 2019 #18
    shortcircuit

    shortcircuit Tele-Meister

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  19. Nov 5, 2019 #19
    drf64

    drf64 Poster Extraordinaire

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    And you may find yourself....

    deep in the guts of a highly modified circuit
     
  20. Nov 5, 2019 #20
    Dacious

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