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NAD...5G3!?

Discussion in 'DIY Amp Forum' started by 93-Strat, Oct 19, 2019.

  1. 93-Strat

    93-Strat Strat-O-Master

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    After my 5E3 incursion and falling in love with it but was a bit loud and hard to tame for my living situation I went back to the drawing board and after much thought I came up with.... the 5G3. 5E3 power section with the long tail pair from the 5G9 tremolux and mixing resistors which I was afraid would remove the volume interaction but it doesn't. It's still there although mostly at the extreme settings of the dial but now the volume controls are voltage dividers instead of variable resistors and the volume is so much easier to manage. All topped off with my favorite speaker... the WGS Veteran.
    20191019_124044.jpg 20191019_124008.jpg 20191019_123846.jpg
     
    Last edited: Oct 19, 2019
    hcski25, rockon1, RJ Squirrel and 6 others like this.
  2. archetype

    archetype Senior Stratmaster

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    That's a cool project. If you would, some sound clips might tell us what that thing sounds like.
     
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  3. 93-Strat

    93-Strat Strat-O-Master

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    Thank you, I'll post some today or tomorrow. It's still very 5E3 but tighter and bolder.
     
    Last edited: Oct 19, 2019
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  4. Sarnodude

    Sarnodude Senior Stratmaster

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    What beautiful wiring!
     
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  5. 93-Strat

    93-Strat Strat-O-Master

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    Thank you!
     
  6. fezz parka

    fezz parka Making a record.... Strat-Talk Supporter

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    Brilliant. :)
     
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  7. 93-Strat

    93-Strat Strat-O-Master

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    I thought you'd like it.
     
  8. 93-Strat

    93-Strat Strat-O-Master

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    Here is a quick clean demo:

     
  9. fezz parka

    fezz parka Making a record.... Strat-Talk Supporter

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    Nice. It really shines at the end when you let the chord ring out. I don't want to be annoying...but do another one and let the chords ring out for at least four beats. Big open chords G Em C and D. You're on to something with this.:)
     
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  10. 93-Strat

    93-Strat Strat-O-Master

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    No problem, I am a chordsy guy. I took it out of town earlier and cranked it up and it doesn't drive very much with a 12ay7 in V1. My other deluxe was filthy with the cathodyne and the 2nd gain stage didn't have a bypass cap.
     
    Last edited: Oct 21, 2019
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  11. fezz parka

    fezz parka Making a record.... Strat-Talk Supporter

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    Just want to hear if the "bloom" is still there. ;)
     
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  12. 93-Strat

    93-Strat Strat-O-Master

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  13. fezz parka

    fezz parka Making a record.... Strat-Talk Supporter

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    Yes!

    It did what you wanted. A blend of 5e3 and 6g3 Deluxe with some 5g9 thrown in. Well done man.
     
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  14. 93-Strat

    93-Strat Strat-O-Master

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    Thanks, I love it and the best part is that I can play without being too loud and sound great and have more volume when I need it.
     
  15. RJ Squirrel

    RJ Squirrel Senior Stratmaster

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    The long tail pair PI cuts the gain in half. A 12AX7 in the V1 slot would probably get you where you want to be. This configuration is close to a 6V6 18 Watt circuit.
     
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  16. RJ Squirrel

    RJ Squirrel Senior Stratmaster

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    FWIW, I was playing around with this circuit a couple of years ago. I got the idea from Bruce Collins at Mission Amps.

    upload_2019-10-21_14-35-40.png
     
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  17. 93-Strat

    93-Strat Strat-O-Master

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    And even closer to the 20 watt! I play clean most of the time and if I want overdrive I have to go somewhere that I can do it so it's not a problem. I was just a bit surprised. I may stick a 12AX7 in just to see what happens.
     
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  18. 93-Strat

    93-Strat Strat-O-Master

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    Very similar but with split cathodes which would just about remove the volume interaction completely but would be useful for someone wanting some more marshall like tones on the other channel. I like the volume interaction and was glad I still had most of it. I can crank the the opposite channel and get just about as much mid scoop as the original without all the hiss.
     
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  19. RJ Squirrel

    RJ Squirrel Senior Stratmaster

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    Very true. It does substantially lessen the interaction of the volume controls. But the circuit does cover a lot of ground. I built the circuit using an 18 Watt output transformer. With that OT, and a G12H30 or G12M20, the normal channel is quite a bit like a baby JTM 45 or 5F6 Bassman. The bright channel captures a lot of the vibe of a Super Lead.

    I may build this circuit again for my son. He's playing his guitar more this days. He likes Marshall tones.
     
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  20. 93-Strat

    93-Strat Strat-O-Master

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    That'd be nice. I have plans to sometime build a 15 watt JCM-800 in a princeton reverb chassis/cab.
     
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