Asher Guitars WD Music Products Amplified Parts Mod Kits DIY Nordstarnd Pickups Warmoth.com
Asher Guitars WD Music Products Amplified Parts Mod Kits DIY Nordstarnd Pickups Warmoth.com
Asher Guitars WD Music Products Amplified Parts Mod Kits DIY Nordstarnd Pickups Warmoth.com

Weber 5f2h mod

Discussion in 'Shock Brother's DIY Amps' started by fensterman, Feb 23, 2017.

  1. tubeswell

    tubeswell Tele-Afflicted

    Jul 1, 2008
    NZ
    I think it would be fine the way you had it in the schematic you uploaded on 7 March (with the series/parallel switchable loop and the FX return virtual earth mixer driving the triode before the output tube). If you are not sure, build it so you have flexibility to make changes. This is important when concocting new circuits.
     
    boredguy6060 likes this.

  2. fensterman

    fensterman Tele-Meister

    154
    Sep 2, 2013
    Mount Vernon, Ohio
    I'm thinking about putting this on three boards
     

  3. fensterman

    fensterman Tele-Meister

    154
    Sep 2, 2013
    Mount Vernon, Ohio
    Back to schematic version 25
     

  4. fensterman

    fensterman Tele-Meister

    154
    Sep 2, 2013
    Mount Vernon, Ohio
    I'm still wanting to add a second channel, I guess I'll just have half of a 12ax7 unused
     

  5. fensterman

    fensterman Tele-Meister

    154
    Sep 2, 2013
    Mount Vernon, Ohio
    Here is an updated schematic IMG_1217.JPG
     

  6. tubeswell

    tubeswell Tele-Afflicted

    Jul 1, 2008
    NZ
    This looks good. An option for the V1 stage with more simplified gain controls (1 instead of 2) could be a switchable single/parallel input stage (like one channel of a tweed pro) - see attachment. This would give you more gain on one jack, or less gain on the other, or auto-mixed stereo inputs for a range of up-front stereo pedals (including a stereo mixing pedal).
     

    Attached Files:

    aerhed likes this.

  7. fensterman

    fensterman Tele-Meister

    154
    Sep 2, 2013
    Mount Vernon, Ohio
    I might put a combo jack on one channel
     

  8. fensterman

    fensterman Tele-Meister

    154
    Sep 2, 2013
    Mount Vernon, Ohio
    Any suggestions on what to do with the unused half of v4?
     

  9. tubeswell

    tubeswell Tele-Afflicted

    Jul 1, 2008
    NZ
    You could use it for a tremolo oscillator that wiggles the bias in the last pre-amp driving stage (like a Vibrochamp). You can make a LFO buffer with a high-voltage MOSFET (such as an IRF820). The circuit values for a high-voltage source follower would be the same as for a cathode follower (i.e. as if you were using the CF in the vibrochamp LFO circuit), you merely substitute the triode with the MOSFET.
     

  10. fensterman

    fensterman Tele-Meister

    154
    Sep 2, 2013
    Mount Vernon, Ohio
    I think I just might try that idea
     

  11. tubeswell

    tubeswell Tele-Afflicted

    Jul 1, 2008
    NZ
    Here's something to help you with the design thinking for the source follower - taken from an old schematic where I used an IRF820 source follower as a buffer stage for a bias-vary trem. However, this won't quite give you what you want for the vibrochamp-type trem circuit - you may want to draw that up yourself. (I didn't have time yet to draw up that). For a start, the 220k load resistor in series with the MOSFET Source will need to be replaced with the 68k resistor and 25kRA pot that are in the vibrochamp buffer stage. Be that as it may, in your substitute circuit, you will still want the 12V zener between the MOSFET source and the gate, and you will most likely want a ~100-200R resistor in series with the gate.
     

    Attached Files:


  12. fensterman

    fensterman Tele-Meister

    154
    Sep 2, 2013
    Mount Vernon, Ohio

    Attached Files:

    Last edited: Apr 15, 2017

  13. fensterman

    fensterman Tele-Meister

    154
    Sep 2, 2013
    Mount Vernon, Ohio
    Here is a better look at the tremolo IMG_1234.JPG
     
    tubeswell likes this.

  14. fensterman

    fensterman Tele-Meister

    154
    Sep 2, 2013
    Mount Vernon, Ohio
    I think I need to keep this simple, and leave the tremolo for next time IMG_1242.JPG
     

  15. fensterman

    fensterman Tele-Meister

    154
    Sep 2, 2013
    Mount Vernon, Ohio
    I've been working on the board layout, will post it when I get it done
     

  16. tubeswell

    tubeswell Tele-Afflicted

    Jul 1, 2008
    NZ
    Looks about right to me
     

  17. fensterman

    fensterman Tele-Meister

    154
    Sep 2, 2013
    Mount Vernon, Ohio
    Well, maybe I will put the tremolo in. I worked on the tremolo board today.
     

  18. fensterman

    fensterman Tele-Meister

    154
    Sep 2, 2013
    Mount Vernon, Ohio
    I'm going to try to fit the tremolo board, where the bias board goes in a PR
     

  19. fensterman

    fensterman Tele-Meister

    154
    Sep 2, 2013
    Mount Vernon, Ohio
    I thought I read somewhere about substituting an LED for the zener diode. Might be neat to see it flashing to the tremolo. Any comments?
     

  20. tubeswell

    tubeswell Tele-Afflicted

    Jul 1, 2008
    NZ
    Yes there are a number of advantages using a red LED inplace of a cathode resistor and cathode bypass cap in an LFO stage - see Merlin Blencowe's article here (bottom of the page). http://www.valvewizard.co.uk/trem1.html
     

IMPORTANT: Treat everyone here with respect, no matter how difficult!
No sex, drug, political, religion or hate discussion permitted here.