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  1. That's funny. '6V6GC', and three 12AT7.

    That's funny. '6V6GC', and three 12AT7.
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    My only guess would be that it pulled down the...

    My only guess would be that it pulled down the heater voltage a bit, and one of the reverb tubes was more sensitive to low heater voltage than the other tubes.
    The heater is the only thing I see in...
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    When it was working without trem and reverb, it...

    When it was working without trem and reverb, it was normal sounding? Or always the 'low and gravelly'?
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    Just to throw some numbers out, although it's...

    Just to throw some numbers out, although it's coming out of the rectifier rather than going in, standard Marshall value is 1AT for 100W and 500mAT for 50W. Rough specs for their PT's should be easy...
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    I was referring to 'bypassing' the transformer by...

    I was referring to 'bypassing' the transformer by using a pre-transformer send.
    As far as increasing that cap value, it sounds like you got a low end boost which you like. I don't know about...
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    Your schematic shows .0033uF, big difference to...

    Your schematic shows .0033uF, big difference to .033uF. Which did you use?

    I would think the transformer is built in to the design, so I doubt it would sound better bypassing it. Could actually...
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    I'm with you, but it's also used to indicate AC,...

    I'm with you, but it's also used to indicate AC, so it can sometimes get a bit problematic. In this case, it's obviously DC, but I do recall cautioning someone against using it once (in a more...
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    I was thinking more about the possibility of a...

    I was thinking more about the possibility of a partial short in the transformer, or a leaky parallel cap.
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    I got a little behind on this one, sorry. Your...

    I got a little behind on this one, sorry. Your 7.3ohm load calculation means your 72VAC was producing around 710watts. Very close. You said your mains voltage was sagging which would probably make...
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    Another thing Tom, your voltages written on the...

    Another thing Tom, your voltages written on the schematic indicate a 700ohm resistance for the transformer. Try disconnecting C21.
    Fender numbers are usually around 1K7 here I think. The peavey...
  11. Jfets are 'on' til you turn them off. So a low...

    Jfets are 'on' til you turn them off. So a low resistance reading from source to drain unpowered is normal.
    I think John just made a typo. :)
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    Do you get that same 475ohm reading for R31 when...

    Do you get that same 475ohm reading for R31 when it's connected in circuit?
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    I don't think resistance numbers will tell you...

    I don't think resistance numbers will tell you anything. Some marshall primary halves can be around 50 ohms where are similar spec'd fender might measure around 200 ohms.
    AC voltage measurements...
  14. Thread: Peavey Bandit 112

    by g1
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    187

    Not UJN but NJU

    Not UJN but NJU
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    At this point I'm thinking your stove elements...

    At this point I'm thinking your stove elements may not be acting the same with signal as without.
    Have you tried swapping them around to see if the imbalance moves to the other side?
    To verify...
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    To be honest, we're much more electronics focused...

    To be honest, we're much more electronics focused here than a amp user type forum would be.
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    There are 2 of the most simple op amp types (with...

    There are 2 of the most simple op amp types (with small tanks) on pg.7 of attached pdf.
    Personally I like the ones that drive the tank a little harder using 4 paralleled sections of a quad op amp...
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    I always start with tone controls on amp set...

    I always start with tone controls on amp set half-way up. Volume start from zero and bring up to comfortable loudness. Adjust tone to what you like as far as how much treble. (guitar volume around...
  19. Thread: Theremin Repair

    by g1
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    241

    Post E,B, & C voltages for Q6,7, & 8

    Post E,B, & C voltages for Q6,7, & 8
  20. When you are comparing, you have the master set...

    When you are comparing, you have the master set full up?
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    I think I now know of a little trick that will...

    I think I now know of a little trick that will make me sound twice as good. ;)
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    Do you have your scope ground disconnected when...

    Do you have your scope ground disconnected when you measure with your DVM from neg to pos ?
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    'battery cover separating forcefully' means...

    'battery cover separating forcefully' means explode, right?
  24. I think what Jazz was getting at, if those...

    I think what Jazz was getting at, if those transistors are obsolete, and you got ebay replacements that came from China, they may be fakes.

    What did you mean by " 'match' to the originals", same...
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    Make sure the pin spacing is same and you are...

    Make sure the pin spacing is same and you are good.
    When diameter matches, the pin spacing is usually right, but it's worth checking.
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    Those are impedance specs. Corresponding DC...

    Those are impedance specs.
    Corresponding DC resistance numbers would be around 35ohms at the input, and around 200ohms at the output.
    So the numbers he gave in post #3 indicate that the transducers...
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    If you want to compare to other amps you need to...

    If you want to compare to other amps you need to also look at the rectifier type, and the standby switch arrangement.
    In this case, the schematic I saw shows the standby switch connecting the HT...
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    Sure, that would be fine. The voltages should...

    Sure, that would be fine. The voltages should come up pretty much instantly when power is turned on.
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