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Super reverb preamp pin voltages

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  • Super reverb preamp pin voltages

    Getting closer to solving this mystery. Thanks to everyone

    Normal channel now has about 1/10th the volume it should have and sounds good

    with more lows ( less sparkle ) than Normal channel.

    Questions :

    V6...pin 2 and 7 ... 26v...any idea why the 26v here ?

    V5...pin 7 ...1v... is this OK ?

    V4...pin 6 ... 38v ( not 230v ) ...and pin 7 ... 3v

    I have all new caps and tubes ordered.

  • #2
    Before getting into voltages I think it'd be good to know which channel you're talking about. Your post says Normal channel twice. Does one channel work well and the other not?

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    • #3
      If this is the same amp, I do believe we are talking about the Vibrato Channel output being low.

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      • #4
        the specific voltages at the pins you highlight are more relevant when put in context with dc voltages across the amp overall & with the other dc voltages for those tubes.

        If the amp is making only 1/10th output, it is broken, I don't see how it can be "sounding good"?

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        • #5
          I think the OP meant the Normal Channel sounds good.
          It is a Vibrato Channel problem.

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          • #6
            Sorry for the confusion lowell....Jazz P Bass is correct...... same amp......low volume on Vibrato Channel. Normal Channel is good.
            MWJB......when I got this amp the tag board was stripped.....when I got it back together there was no sound at all from Vibrato Channel...then, after resoldering the chassis grounds, I was able to hear a very low volume but with distortion, and now, after more cap and resistor changes I now have a clear sound with absolutely no distortion. New preamp tubes should be here Friday........ I am slowly learning some of the concepts of how/why tube amps work but as you can tell I am a "toddler in training"...............my biggest fear at this point is that the problem we find with this Super will be another DUH moment........bad ground or fried resistor...
            go figure....

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