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    Or just tweak it and it sounds great like I did.

    Or just tweak it and it sounds great like I did.
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    The later version with a bad switching chip can...

    The later version with a bad switching chip can cause this same problem, that's how I got a 2210 cheap.

    So it may be something in the switching circuit.
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    Oh, and check the FX loop, does the noise change...

    Oh, and check the FX loop, does the noise change when a cord is plugged into FX return?
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    Check the DC filaments for hum/ripple, often the...

    Check the DC filaments for hum/ripple, often the rectifier diodes for DC filaments go bad.

    Are they burnt looking/discolored?
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    Ha,ha,. Complete with an LED to make the tube...

    Ha,ha,. Complete with an LED to make the tube glow.


    If I find a dead SS Cambridge or Pathfinder I'll guy it and turn it into a tube amp.
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    Finally found the right schematic for this. ...

    Finally found the right schematic for this.

    Re-worked the reset circuit and so far it seems to be working properly, we'll see if it holds.
  7. Thread: Russian Big Muff

    by drewl
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    In Russia, Big Muff distorts you.

    In Russia, Big Muff distorts you.
  8. Thread: Russian Big Muff

    by drewl
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    198

    Yeah, I have a few of the plastic pots from a...

    Yeah, I have a few of the plastic pots from a MIG60 I had replaced for a customer who wanted them upgraded .

    These Muffs are really something to behold.

    Some wires are cheap and thin, while...
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    Vox VT15 stuck in power up loop.

    Hmm, thought I solved this.

    These amps sometimes have a problem where it will randomly go into power up mode, where the lights flash in sequence and it gets stuck in this loop.

    Sometimes at...
  10. Thread: Russian Big Muff

    by drewl
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    It was probably a missile control launch box or...

    It was probably a missile control launch box or spare tank parts, repurposed!

    The electronic parts of this era are great, it's the pots and Jack's and such that are problematic.

    Same with the...
  11. Thread: Russian Big Muff

    by drewl
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    Russian Big Muff

    Nyet!
    What insane mad Russian designed the enclosure for these versions?

    Restored one that was just parts in a bag.
    Forgot the last time I worked on one, took a few minutes to figure out how it...
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    Saw it a while ago. If those walls could talk.

    Saw it a while ago.

    If those walls could talk.
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    I'm sure there are some out there that say they...

    I'm sure there are some out there that say they can hear the difference !
    Not me!

    Kind of an incomplete sentence on my part.
    I did some other tweaks and set it up like a '69, just to get it as...
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    FWIW, I have a 73 MKII 50Watt that had the 150K...

    FWIW, I have a 73 MKII 50Watt that had the 150K resistors as it probably had 6550's originally.

    Someone had already installed EL34's when I got it in 1988.

    I changed them to 220K, and changed...
  15. Thread: Sound City 120

    by drewl
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    Those 1meg bandpass resistors are usually the...

    Those 1meg bandpass resistors are usually the cause of him and his from the preamp.

    It's a pain but best to just replace them.
  16. Thread: Sound City 120

    by drewl
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    301

    I had one, sounded great once you learn to dial...

    I had one, sounded great once you learn to dial them in.

    If you don't have voltage on v2 pin 6, check the plate resistor.
    It could be open, or check the coupling cap.
  17. I always check pinout to see if they're good.

    I always check pinout to see if they're good.
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    That's pretty normal for these. Guess that's...

    That's pretty normal for these.

    Guess that's why people wire them up like a Plexi.
  19. Check your low voltage power supplies for the...

    Check your low voltage power supplies for the heck of it.

    I know the screen on these can have problems over the years, but it wouldn't throw error codes.
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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.
  21. Thread: Rivera troubles

    by drewl
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    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.
  23. Thread: Rivera troubles

    by drewl
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    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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