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  1. And in many amps, when you put your meter probe...

    And in many amps, when you put your meter probe on a pin 3, it causes the amp to oscillate. So pulling the PI tube stops that oscillation, but doesn't alter the plate voltage.
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    Look at Fender 5E2 schematic. They used a 470...

    Look at Fender 5E2 schematic. They used a 470 ohm. Sounds good to me. Whatever you choose will likely work
  3. I am not a go back and edit fan. it gets...

    I am not a go back and edit fan. it gets confusing when we write something, then someone responds, and the the OP goes back and changes what they wrote before.

    Q8 is controlled by the voltage at...
  4. The PP means push-push type switch. SU, I THINK...

    The PP means push-push type switch. SU, I THINK means standup. meaning the switch sticks straight up from the board, contrast with some panel switches which mount parallel to the board. I don't...
  5. You put up the drawing for 5150 Combo, but you...

    You put up the drawing for 5150 Combo, but you refer in your text to 5150. Those are two very different amps. WHich one do you actually have?

    Assuming the combo, With switch open, Relays K1,K2...
  6. Policies can always change, so it can't HURT to...

    Policies can always change, so it can't HURT to call Nady and ask. However in my experience over the years, they have always said they do not issue schematics. At the time, my service facility was...
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    Only certain tubes have the 11 second controlled...

    Only certain tubes have the 11 second controlled warmup. Tubes for TV sets say, where 25 tubes all need to come up at about the same time. Table radios. I recently ran a collection of tubes...
  8. In my experience, Peavey transformers have always...

    In my experience, Peavey transformers have always been robust, not on the cheap end.
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    Do we have the schematic on this, and like you...

    Do we have the schematic on this, and like you could post it?

    What pots do you have on hand? If you have a common 1 meg pot, try it in the circuit. It surely cannot harm anything, and if the...
  10. A "dirty" switch does not mean mud and grease, it...

    A "dirty" switch does not mean mud and grease, it means electrically dirty. Dirty switches can look good as new.
  11. The bulb limiter is a very useful tool, but you...

    The bulb limiter is a very useful tool, but you cannot rely on voltage readings taken while on it.
  12. I may be old, but I can still be quick.

    I may be old, but I can still be quick.
  13. Yes, the hotter you bias the tube, the more...

    Yes, the hotter you bias the tube, the more current it draws. That current comes ultimately from the wall outlet mains supply, hence the bulb brightens.
  14. C9? I don't see part numbers on your schematic....

    C9? I don't see part numbers on your schematic.

    Your schematic shows a transformer part number. If those are not available, it seems to me you could mount a Fender transformer, and change the...
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    The difference between 50 watts and 100 watts is...

    The difference between 50 watts and 100 watts is only 3db. Whatever tiny power differences may occur will be barely audible at best.

    I suspect the main differences we hear is a bit of gaininess...
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    Many share that experience. I believe some...

    Many share that experience. I believe some folks get differences they hear and have preferences, but if all is pretty much equal for your ears, then set it at the colder setting, and your tubes...
  17. You alter the amp to accommodate your tubes, or...

    You alter the amp to accommodate your tubes, or you alter your tubes to accommodate your amp. Those are your choices. Altering the amp requires soldering parts.
  18. I never heard it before. NC and NO are my...

    I never heard it before. NC and NO are my letters for relays. MAke before break switch contacts are called "shorting" contacts.

    In my work in amusements we had pinballs FULL of relays, as well...
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    Some people do not understand the difference...

    Some people do not understand the difference between voltage ON a part and voltage THROUGH a part, so it bore further explaining.


    A internal pot shorting to a metal shaft? The metal shaft sits...
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    HAving discussed it with Peavey, for years they...

    HAving discussed it with Peavey, for years they made their amps not adjustable. They designed amp with the tone coming from the preamp, and expected the power amp to be clean, loud, and reliable. ...
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    Your typical Fender amp is cooler than 70% as...

    Your typical Fender amp is cooler than 70% as shipped.

    In my experience, the super gainy Peavey 5150 sits at about 11-15ma idle current. SO maybe 7-8 watts, so about 25%.
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    Neither is incorrect. What is incorrect is the...

    Neither is incorrect. What is incorrect is the idea that the bias is some super critical precise adjustment. You can bias an amp so hot the tubes get red hot from excessive current. What we call...
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    Just to let you know, pepe has not logged on in...

    Just to let you know, pepe has not logged on in about six years, so he may not get this message.
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    Voltage is just a possibility. The thing to do...

    Voltage is just a possibility. The thing to do is just measure for it. If we find it, we can figure out why it is there. If there is no voltage, then there is no voltage to explain. And we move...
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    There is one more part. In the example above,...

    There is one more part. In the example above, the 25k pot can turn to zero. SO we replace the pot with a pot and series resistor. Instead of 25k pot, we use a 10k pot with a 15k resistor in...
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    How would those stages know when you turned the...

    How would those stages know when you turned the control? I'm with Helmholtz, check for stray DC voltage on the noisy control. DC on a pot makes them noisy.

    You need to be aware there is only...
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    Convention. Many schematics have a set of notes,...

    Convention. Many schematics have a set of notes, REad them. It says "all unpolarized capacitors in uf", plus "unless otherwise noted.". That way they don't have to write "uf after each one to...
  28. There are a number of formats within the...

    There are a number of formats within the software, you can select the one you prefer. I suspect the other computer had its cookie remembering a diffrent format than your usual.
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