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Talk me out of it...or into it

Discussion in 'Shock Brother's DIY Amps' started by Mark the Moose, Jan 16, 2021.

  1. Jan 16, 2021 #1
    Mark the Moose

    Mark the Moose Tele-Afflicted

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    I have a Weber 6a14hp which I built a year ago, a 35 watt Princeton Reverb with a 1x12 cabinet. I’m considering a rebuild with a few upgraded components and reconfiguring the circuit to a single channel 6g16. Seems like it would require very minor changes. Cautions or encouragements?
     
  2. Jan 16, 2021 #2
    Twang Deluxe

    Twang Deluxe Tele-Holic

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    Sounds like a great project
     
  3. Jan 16, 2021 #3
    Mark the Moose

    Mark the Moose Tele-Afflicted

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    Looks like a few minor changes to the preamp and a little reconfiguration of the power section...simple enough. More work will go into adding another tube.
     
  4. Jan 16, 2021 #4
    Lowerleftcoast

    Lowerleftcoast Friend of Leo's

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    What is the 6a14hp lacking? What are you hoping to gain?
     
  5. Jan 16, 2021 #5
    strat a various

    strat a various Friend of Leo's

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    Do it! With one hand tied behind your back.
     
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  6. Jan 16, 2021 #6
    Mark the Moose

    Mark the Moose Tele-Afflicted

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    I really love a Princeton reverb and a 63 vibroverb. This one is a little bit both but not really either one. Originally I intended to sell it to fund some more builds but I’ve not had any luck. A PR seems like a good first scratch build, while this amp seems like a good candidate to convert to a vibroverb.
     
  7. Jan 16, 2021 #7
    cometazzi

    cometazzi Tele-Holic Silver Supporter

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    You could turn it into a Vibroverb. If you ever reminisce too much about the Princeton Reverb, you could just build one as a separate amp.

    See how I just doubled your projects?
     
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  8. Jan 16, 2021 #8
    Mark the Moose

    Mark the Moose Tele-Afflicted

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    That’s where I’m landing as well.
     
  9. Jan 16, 2021 #9
    Mark the Moose

    Mark the Moose Tele-Afflicted

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    That’s where I’m landing as well.
     
  10. Jan 17, 2021 #10
    Lowerleftcoast

    Lowerleftcoast Friend of Leo's

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    Post #8 and post #9
    :lol::lol::lol:

    Now that is funny right there.
     
  11. Jan 17, 2021 #11
    Wally

    Wally Telefied Ad Free Member

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    What is it in the 6G16 that you are wanting? You can utilize a tapped treble pot if you want to experiment with that difference. If the phase inverter difference bothers you, that is a more intense problem to address and imho would be better dealt with using a new build.
     
    Last edited: Jan 17, 2021
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  12. Jan 17, 2021 #12
    Mark the Moose

    Mark the Moose Tele-Afflicted

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    That is the other route. Change the PT leads, swap the OT down for a PR 6V6 configuration and rework the bias values. Then plan for a 6g16 build.
     
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  13. Jan 17, 2021 #13
    Wally

    Wally Telefied Ad Free Member

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    Mark, before you do that, why not try the tapped treble pot and put a potentiometer in series with the NFB resistor so that you can warm up that output as was done in the 6G16. You might find that these changes are meaningful?? My 1963 prototype BF Pro has the tapped treble pots...original pots....and it does not sound quite like any other BF amp, ime. It is the only BF amp that I have seen or heard of that has those tapped treble pots.
     
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  14. Jan 17, 2021 #14
    Mark the Moose

    Mark the Moose Tele-Afflicted

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    That's a good idea. I already have a nfb switch which doubles the resistor value, which I like a lot.
     
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  15. Jan 18, 2021 #15
    The Ballzz

    The Ballzz Tele-Afflicted

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    @Wally
    Please describe/explain the term "tapped treble pot" as I haven't a clue? Pic/drawing/schematic would be helpful , given that I'm an idiot!
    Thank You Sir!
    Gene
     
  16. Jan 18, 2021 #16
    Wally

    Wally Telefied Ad Free Member

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    In the larger 6G amps, Fender used a tapped treble pot. As opposed to what we are accustomed to seeing...a three lug pot....those pots were 350k pots with a tap at 70k. Here is an explanation and some pics of a modern tapped pot. WEber sells...or did sell...a 250k pot with a tap at 70K.

    https://sites.google.com/site/chosenaudioproducts/tuxedoamp/tappedpot
     
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