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  1. It is extremely unlikely Fender put it together...

    It is extremely unlikely Fender put it together wrong. I agree with Dude. I don't know how we could say no one had ever taken it apart.

    I call this the Fender Wedge Chassis. Perhaps no one...
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    How about this: perhaps the original amp didn't...

    How about this: perhaps the original amp didn't have the triode switch. The two 820 ohm resistors were soldered pin 4 to pin 6 on each socket the way a zillion Fender amps are wired. They added...
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    So put the unit on a current meter. What is the...

    So put the unit on a current meter. What is the mains current draw. Is it a steady highish current just waiting for a "straw that broke the camel's back" to pop a fuse? or is it sitting at a...
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    Does the switch do this with ALL power tubes...

    Does the switch do this with ALL power tubes removed?
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    OK, so you had a bad tube, and what do you know,...

    OK, so you had a bad tube, and what do you know, all the good tubes you tried work OK. You can swap them around all you like, the bad tube won't work well.
    What is the mystery?

    ANY tube can...
  6. Careful, the ones at Mouser and the other place...

    Careful, the ones at Mouser and the other place are not photoresistors, they have phototransistors as outputs.
    https://www.mouser.com/datasheet/2/414/OPI110-1264-1530631.pdf
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    What is the difference between "correcting" a...

    What is the difference between "correcting" a ground loop and curing one? It would seem to me that if connecting two grounds together stops a hum, then it was what was needed in the first place.

    ...
  8. A positive on the grid will cause the tube to...

    A positive on the grid will cause the tube to conduct hard which will drag the plate voltage down. Fix the +2 on the grid and your plate will likely rebound just fine.
  9. Make sure the solder there is in good shape. ...

    Make sure the solder there is in good shape. Darker doesn't hurt anything until it turns black and carbonizes.
  10. If pin 7 has zero volts with no tube and +2v with...

    If pin 7 has zero volts with no tube and +2v with a tube, then that sounds like a bad tube to me.

    And as glebert said, a leaky cap in the tone stack could put +2v there.
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    NO lack of function. As was explained, the...

    NO lack of function. As was explained, the sliders are there to vary a control voltage. They are all wired across the +5 supply, and the wiper makes a control voltage that varies from 0 to +5v. ...
  12. We had a server crash a few years back and many...

    We had a server crash a few years back and many files were lost. The titles remain but they contain a 1x1 pixel image.
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    PP1045SB at Digikey comes up with the EWA number...

    PP1045SB at Digikey comes up with the EWA number but for me lists it as non-stocked.

    But at least it identifies EWA as a Panasonic number series.
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    I don't know who made the originals. Alps,...

    I don't know who made the originals. Alps, Noble, Alpha were common brands.

    Look again at the data sheet g1 posted. Do you realize almost all pots and certainly sliders are custom made for the...
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    But look at the data sheet g1 posted for your PTA...

    But look at the data sheet g1 posted for your PTA series part. The pins are two directly on one end and one directly on the far end. The ones you need have four pins on the sides near the ends, not...
  16. Why did you change all those parts? What does...

    Why did you change all those parts?

    What does the distortion look like? Do you have a scope? If no scope, make yourself a "signal tracer probe" so you can listen to the signal as it passes...
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    It is what the 5150 is an example OF that matters...

    It is what the 5150 is an example OF that matters here. That is a cathode follower, so there is close to B+ voltage in the circuit at the cathode. Other amps are not driving the FX send with a CF....
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    I have great respect for Merlin, but Since the...

    I have great respect for Merlin, but Since the 5150 came out I have never seen a voltage spike problem on the FX send. That 100k to ground at the output keeps teh cap from sending charging currents...
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    The fact you can grab it and it stops tells me we...

    The fact you can grab it and it stops tells me we have acoustic feedback. SO our job is to keep the acoustic energy our of the pan. Thus covers and bags, and indirectly my stick on foam strip.
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    When it feeds back, reach around the pan and just...

    When it feeds back, reach around the pan and just grasp it firmly. Does that stop it? I am looking to see if it is acoustic in nature. I can't imagine what else.

    Have you put a cover on the...
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    I can see different speaker doing it, but the...

    I can see different speaker doing it, but the magnet would not be why.
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    Are we talking the little board where the AC...

    Are we talking the little board where the AC power cord plugs in? Those things often crack their solder, and then they arc, causing burn. QUite possible the varistor itself is OK. Or Thermistor. ...
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    Here is the standard procedure. The pan is never...

    Here is the standard procedure. The pan is never to be tightly screwed to the cab wall. Screws should only be tight enough to keep the pan from moving around the cab. The pan should be put in a...
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    You said a MOD reverb did not feed back? But the...

    You said a MOD reverb did not feed back? But the original does? That suggests to me the problem is the pan, not the amp.
  25. On the other hand, many times "goo coming out" in...

    On the other hand, many times "goo coming out" in an amp is just glue used to hold larger parts steady.

    it makes a loud noise when you hit the amp. But when you are not hitting it, and it is not...
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    A minus reading on an ohm meter means there is...

    A minus reading on an ohm meter means there is voltage in the circuit. There is no such thing as negative resistance. If you measure a cap with a meter, it will usually start relatively low and...
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    It is unlikely the exact same thing is wrong with...

    It is unlikely the exact same thing is wrong with both amps. We just start on yours and troubleshoot to find the source of the problem. I suggest you start a new thread for your amp though.
  28. A loose connection or broken solder joint. Look...

    A loose connection or broken solder joint. Look VERY closely at the solder on the pins of the power tubes. I bet you see some cracks.
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