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  1. Replies
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    Also the stereo Insert Jack's are like an FX loop...

    Also the stereo Insert Jack's are like an FX loop and can kill or attenuate the signal if bad.
  2. Thread: Rivera troubles

    by drewl
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    112

    One side of the ldr will have DC voltage, that...

    One side of the ldr will have DC voltage, that voltage will change when it is turned on or off, look at the scematic to see which ones turn on or off for channel 1.

    The other side of the ldr acts...
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    Amen. So much easier to text customers than...

    Amen.
    So much easier to text customers than trying to phone, not being able to get in touch.

    I send a text with an estimate and usually get prompt responses.
  4. Thread: Rivera troubles

    by drewl
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    112

    Hey, that looks familiar! You have a scope?...

    Hey, that looks familiar!

    You have a scope?
    Just follow the ch1 signal through V1 and 2.

    And yes, the Vactrol LDR's can go bad.

    You can hot down which ones control the channel switching and...
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    Yeah, musicians can be some of the strangest...

    Yeah, musicians can be some of the strangest people you'll ever encounter.

    Back in the days before texting my wife could not believe some of the oddball phone messages I'd get.
    Half the people...
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    Okay, so the 12v regulator for channel switching...

    Okay, so the 12v regulator for channel switching is on the rear FX board.
    So is the 100uf filter cap for the 12v supply.

    Hit it with a can of trusty freeze spray and POOF! MAGIC!

    The...
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    Damn, something from the rear f/x loop board or...

    Damn, something from the rear f/x loop board or switching is the root cause .

    Unplug signal connectors, oscillation still there, unplug power to fx board, it goes away.

    High voltage does not...
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    After letting heat up for a few hours it finally...

    After letting heat up for a few hours it finally started oscillating again.

    Seems to be coming from reverb send amp.
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    Amp was out of cabinet, away from speaker which...

    Amp was out of cabinet, away from speaker which is a good eight feet away.
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    Rivera Reverb Shriek

    So, got a Rivera Knucklehead 55 that the reverb would squeal on both channels after it was hot.


    I could duplicate the problem by turning the FX loop on/off quickly with the footswitch.
    The...
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    Fwiw I have bought used pulled obsolete chips...

    Fwiw I have bought used pulled obsolete chips from several places without any problems.
  12. Thread: PT spludge

    by drewl
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    149

    I don't know if that's stock spooge, or...

    I don't know if that's stock spooge, or accumulated splooge but my '67 Pro Reverb looks the same.

    I use a SS plug in rectifier to keep the PT a little cooler and it's been fine for the past twenty...
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    I explain it like this: If you have the brakes...

    I explain it like this: If you have the brakes fixed on your car, they aren't going to replace the transmission for free if it goes bad shortly after.

    Edit: I see Leo already made the same point!
  14. Yeah, I'm glad I live in location that doesn't...

    Yeah, I'm glad I live in location that doesn't experience any cataclysmic events.
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    Someone actually did the mod in the second link...

    Someone actually did the mod in the second link you posted as it has a pair of 6Z5 output tubes in it.
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    Yeah, that's it alright, thanks. Figured it...

    Yeah, that's it alright, thanks.

    Figured it was one of the generic Supro/Valco/Sears family.

    Looks good, sounds good.
    Just not much power for it's size.
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    What amp is this?

    Hey guys, anyone know what kind of amp this is?

    Old 60's I'd guess.
    5Y3 rectifier
    3 12AX7's
    2 6973's

    Similar construction/chassis as a Silvertone.
    2 channel, trem on ch 2.
  18. Many of the cheap little old amps didn't have...

    Many of the cheap little old amps didn't have fuses, so I always install one.
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    I've always had problems with JJ's of all type. ...

    I've always had problems with JJ's of all type.

    I have used a Hotplate with my own Marshalls with EH EL34's with no failures.
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    Do you have pix of the boards on your site? ...

    Do you have pix of the boards on your site?
    I'm not seeing them. I'd love to take a look a the 7- series boards and your incredible work.
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    DL4 switches are momentary

    DL4 switches are momentary
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    I've had to drill out bc sections of fried...

    I've had to drill out bc sections of fried boards.

    After cleaning check for any stray resistance before coating in your substance of choice.
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    Which can be mounted on top by trimming the legs.

    Which can be mounted on top by trimming the legs.
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    Find an old dead VCR or old Digitec pedal they're...

    Find an old dead VCR or old Digitec pedal they're used in them.
    Actually try Digitech, I got some from them years ago.

    I have several in all different sizes from old dead stereos VCR's etc.
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    Sticky: Great idea from the other thread. Some...

    Great idea from the other thread.

    Some incredible info has been shared here, finding the right parts we need will be extremely helpful.
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    I've been doing work for another store the past...

    I've been doing work for another store the past few months with a similiar situation.

    I don't get good info of what the owner wants fixed and who knows how much they are tacking into the bill but...
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    Is the cabinet cool looking? I'd probably gut...

    Is the cabinet cool looking?

    I'd probably gut it and turn it into a tube amp, doesn't help, just sayin'

    That's what I did with an early 70's SS Marshall 2x12 combo.
    Now it's a 1987/2204 flame...
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    And that was it, bad plate cap

    And that was it, bad plate cap
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