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  1. Replies
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    I don't really care for the idea of using the...

    I don't really care for the idea of using the existing connector, but you could use a crimp type butt connector, then heatshrink over. Or solder splice w/heatshrink as mentioned.
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    I guess no difference with footswitch connected...

    I guess no difference with footswitch connected or not?
    Have you eyed up the layout drawing for any wiring dressed out of whack?
  3. Are you able to translate Chuck's schematic to a...

    Are you able to translate Chuck's schematic to a layout?
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    949

    I thought it had yet to be proven that the audio...

    I thought it had yet to be proven that the audio fault always corresponded to the oscillation seen on the scope.
    I think that assumption may be preventing or at least slowing down solving the...
  5. Thread: Flex harness repair

    by g1
    Replies
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    191

    This is what they used to call FPC (flat pack...

    This is what they used to call FPC (flat pack connector)?
    I was wondering if that was what was being discussed but I saw mention of carbon. Couldn't tell from the svce. man. which piece was being...
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    I thought maybe Helmholtz was referring to the...

    I thought maybe Helmholtz was referring to the inductance of the meter stopping the oscillation when probing certain points.
  7. Thread: Flex harness repair

    by g1
    Replies
    11
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    191

    Service manual here: ...

    Service manual here: https://freeservicemanuals.info/en/servicemanuals/download/Sony/tc-fx5c.pdf
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    ...

    ...
  9. Thread: Crate GT-50 Issue

    by g1
    Replies
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    172

    Yes, be sure to also check those bias filter...

    Yes, be sure to also check those bias filter caps, C46 & C47. You can check for AC volts at C47, should be in the millivolts AC. (no signal applied).
    It's not likely that it just started to...
  10. You can modulate (or apply signal) through the...

    You can modulate (or apply signal) through the cathode or the grid.
  11. Replies
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    That model has a switch for normal (4.8cm/sec) or...

    That model has a switch for normal (4.8cm/sec) or high (9.5cm/sec) speed.
    There are 2 trim pots, one for normal, and one for high speed.
    You need to adjust with pitch control set to 0 (middle). ...
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    Are you allowed to post them here?

    Are you allowed to post them here?
  13. Replies
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    246

    That model doesn't have the mono option so no...

    That model doesn't have the mono option so no stereo/mono switch. That's the part that is missing in the 120/120 schematic.
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    Try searching the IC part numbers til you find...

    Try searching the IC part numbers til you find the LED meter driver.
    If it's BA6137, the MT400 manual might help. If it's IR2E27A, the MT120 manual might help.
    From the driver you can check back...
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    The most critical part of the schematic (for this...

    The most critical part of the schematic (for this problem) is missing. (left side of pg.4 of pdf)
    Does anyone have the complete schematic of the 'pwr amp patch board' ?
    I assume that is where the...
  16. Thread: Peavey 70420211

    by g1
    Replies
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    103

    Look on their cross-ref for DG-211 (pg.15 of 24...

    Look on their cross-ref for DG-211 (pg.15 of 24 on my pdf version)
  17. Replies
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    You may not get very far on this one without the...

    You may not get very far on this one without the service manual. Unless you have already identified the Meter drive IC and are working from a pin-out. Then you can follow back from the IC if it is...
  18. Replies
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    99

    Do you have other tubes to try?

    Do you have other tubes to try?
  19. That's funny. '6V6GC', and three 12AT7.

    That's funny. '6V6GC', and three 12AT7.
  20. Replies
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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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    949

    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...
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