taking out the pre-amp tube of non-reverb channel

Discussion in 'Amps and Cabs' started by yawiney, May 3, 2015.

  1. yawiney

    yawiney Member

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    Hi, I have a Fender Deluxe Reverb re-issue and have been wondering about that trick alot of people do on Supers, (taking the tube for the non-reverb channel out to get break up at lower volumes), would work with my Deluxe re-issue. Anyone here do this?
    Of course I am playing thru the reverb channel and don't use the other one.
    Thanks.
     
  2. zenas

    zenas Member

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    That works on the two channel blackfaces (and amps like them) because of the way the tubed are wired. V1 and V2 share a resister and capacitor for bias. Pull one tube and the bias on the other changes.
    (we only talk about power tube bias but those little tubes are biased too)

    It's not something that works on any amp depends on how it's wired.

    Shouldn't post before coffee. I read Hot Rod Deluxe?
    OK you got a DRRI **** man yank V1 and try it !
    Might as well try a 12ax7 in the phase inverter while your at it.
     
  3. Blue Strat

    Blue Strat Member

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    Yes, it works in those amps.
     
  4. yawiney

    yawiney Member

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    Awesome. Thanks! Now just have to look in there and make sure I'm getting the V1.
    What would changing the phase inverter tube to a 12AX7 do?
     
  5. Blue Strat

    Blue Strat Member

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    make the amp break up quicker too.
     
  6. yawiney

    yawiney Member

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    Thanks again. I'm assuming the V1 is the 1st of the pre-tubes going from left to right. Dosn't say in the amp.
     
  7. Blue Strat

    Blue Strat Member

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    Left from the front of the amp, right from the back of the amp...closest to the normal channel input.
     
  8. yawiney

    yawiney Member

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    Got it. So that one I take out will be 12AX7A. Would it still do the same thing to swap with the phase inverter tube? Or does the "A" make it different?
     
  9. yawiney

    yawiney Member

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    Just went to pull it out and it was already gone. Must have been that way for years.
    Havn't tried to use the normal channel.
    Now i really want to swap the other one!
     
  10. Blue Strat

    Blue Strat Member

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    The "A" suffix has no influence.
     
  11. yawiney

    yawiney Member

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    Thanks. I'm assuming it won't mess up the bias, or have to be re-biased afterwards.
     

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