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  1. Replies
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    Thanks vintagekiki for your reply. I no longer...

    Thanks vintagekiki for your reply. I no longer have the amplifier.
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    magnecord p73j

    Hi everyone. Has anyone seen or know where to get this schematic? Tube complement is (4) 5879,12au7,12bh7,12ax7,(2) 6v6, and 5y3.
  3. Weber W025130, The secondary voltage is only...

    Weber W025130, The secondary voltage is only slightly higher and it's a lay-down. About 50$.
  4. It looks like those two resistors affect how...

    It looks like those two resistors affect how feedback is introduced into the long tail pair, is that correct?[/QUOTE]

    Not how but how much. I only intended to show the Fender circuit for reference.
  5. Look at Concert 6G12A.

    Look at Concert 6G12A.
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    Hi again Thanks for all the info. I went with...

    Hi again
    Thanks for all the info. I went with the 4 diode approach. So far so good.
    Chuck
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    Thanks pdf64. The Valve Wizard does indeed refer...

    Thanks pdf64. The Valve Wizard does indeed refer to the use of the 1N4007.
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    SS rectifier diodes?

    Hi all.

    In the Bandmaster AB763 and other BF amps what type diodes were used, and why are there 6 of them. Would two 1N4007s do the same job?
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    Thanks Tom. I wish I had saved some of the old...

    Thanks Tom. I wish I had saved some of the old catalogs. Anyhow, that upsets the applecart as far as money saving reasons. Too bad the original designer can't chime in.
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    I find it odd that throughout the years, even...

    I find it odd that throughout the years, even after the CBS buyout, and in all models, that cap stands out as unusual. Fender probably bought thousands of .1-400v and still specified that odd cap in...
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    Fender Long tail pair phase inverter

    Does anyone know why the capacitor in the fender phase inverter is specified as .1-200? Why specifically 200 volts? What was the original rationale?
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    Thanks Jazz. I hadn't looked at the TAD sight....

    Thanks Jazz. I hadn't looked at the TAD sight. That looks like the perfect choice.
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    vibrolux 6g11-a

    Hi to all.

    Does anyone know the voltage and current ratings of the transformer listed on the fender schematic as 125p6a?
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    [QUOTE=pdf64;361551]'I only have one other ab763...

    [QUOTE=pdf64;361551]'I only have one other ab763 amp, a deluxe reverb, and it starts to clip at about 8 on the volume knob.'

    That seems unusual; maybe the volume controls have been replaced with...
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    I guess you are right. I went back over...

    I guess you are right. I went back over everything, and both amps start to clip at about 6 or so, and only when I hit the strings pretty hard. Thanks!
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    I only have one other ab763 amp, a deluxe reverb,...

    I only have one other ab763 amp, a deluxe reverb, and it starts to clip at about 8 on the volume knob.
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    B+ at c node is 438v. I did try a new 12at7. I...

    B+ at c node is 438v. I did try a new 12at7. I measured the output with an AC voltmeter and got 18 volts sine wave up to 26.6 volts almost square. The output is biased at 34ma on each side.
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    ab763 pi saturation

    I just finished a Vibroverb build. The amp sounds good up to about 4-5 on the volume controls of both channels, then clipping begins. The voltages on the phase inverter are Pin1-291 volts, Pin 2-44...
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