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  1. Replies
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    Yes, cathode bias. I interpret the empty...

    Yes, cathode bias.

    I interpret the empty circle as an unused B+ node. They left it in the drawing.

    Two fuses like on many AMpegs. One is external, as in you can change the fuse from the...
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    And have you skimmed through the huge selection...

    And have you skimmed through the huge selection of "tactile switches" at Mouser?
  3. You can see in your photos that the secondary of...

    You can see in your photos that the secondary of the OT is wired directly to a speaker, and then two wires put the other speaker in parallel. That is sufficient for operation, after all, a hand...
  4. And cheap amps like this come into the USA by the...

    And cheap amps like this come into the USA by the containerload. On a per-piece basis that costs FAR less than shipping an individual amp.



    And people have no idea what repairs cost. SOme...
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    Steve, those are very old numbers. What are the...

    Steve, those are very old numbers. What are the parts FOR? And are you maybe confusing slider and spider pots? I still have some 711900094 and xxx00097, which are in fact sliders. They used...
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    I always used the phone with Peavey, they were...

    I always used the phone with Peavey, they were very receptive and could answer stock questions while I was there.

    As soon as I read "10 week backorder" the first thing in my mind was a PV spider...
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    When I had work coming in through dealers I...

    When I had work coming in through dealers I always made sure they got me phone contact numbers of the owner. I wanted to be able to directly discuss the nature of the problem.
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    NTC is another way to do it, yes, but I have...

    NTC is another way to do it, yes, but I have rebuilt enough Behringer SMPS with a relay shunting resistors in that function. We don't seem to have a schematic here, so I believe you, but we are...
  9. If you didn't already, google "low battery...

    If you didn't already, google "low battery indicator" and get much information.
  10. Tom, it is straightforward. Consider C24. One...

    Tom, it is straightforward. Consider C24. One end is grounded. the other gets signal voltage from the output of the amp. It feeds through a couple resistors. So the output of the amp swings both...
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    Many SMPS have a soft start, like a low...

    Many SMPS have a soft start, like a low resistance with a shorting relay. Possible that using the variac fools the soft start circuit.
  12. Yes, because the polarity of any voltage across...

    Yes, because the polarity of any voltage across them can be either positive or negative.
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    Agree^^^^ Remember, this is just a guitar amp,...

    Agree^^^^

    Remember, this is just a guitar amp, not a NASA laboratory thingie. Read "direct replacement for 6L6" and stop. Treat it like any 6L6.
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    No, your guy already told you, the reverb has its...

    No, your guy already told you, the reverb has its own little speakers. If you wire all the speakers up to the main, then there is nothing to produce reverb sound. Look at the schematic, the reverb...
  15. Thread: Help with Pmh2000

    by Enzo
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    203

    I am sorry, I was being casual, and I shouldn't. ...

    I am sorry, I was being casual, and I shouldn't.

    Yes, the 3080 means the LM3080. It is used as a compressor, and if removed, the amp still works but loses the compressing function. That is it...
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    I see no reason why not. As a repair it seems...

    I see no reason why not. As a repair it seems clumsy, but for testing it is pretty much the same as using a bench supply.


    Use your meter to see if output devices are shorted.
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    And welcome to the learning curve. That...

    And welcome to the learning curve.

    That happens to everyone. Maybe that amp repair that should have been easy but took eight hours? Or this...

    If you decide you can't get efficient enough at...
  18. Thread: Help with Pmh2000

    by Enzo
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    203

    Repair your power supplies before deciding ICs...

    Repair your power supplies before deciding ICs are bad. They cannot possibly work with one of their power supplies missing.

    The whole circuit cannot work without proper power supply. I can say...
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    Well if you want to interpret everything that...

    Well if you want to interpret everything that way...


    But this was just a conversation that didn't satisfy you, it will fade away on its own. It stands as an example of how not to get along...
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    You are correct, I forgot we had the good photos.

    You are correct, I forgot we had the good photos.
  21. Thread: Conn Dynalevel

    by Enzo
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    The light tower is essentially a VU meter. You...

    The light tower is essentially a VU meter. You sing or play into the mic, and it lights up per your level.

    I helps you learn to sing/play at a steady level. I used to work with a singer who had...
  22. I don't recall what you did, but I explained how...

    I don't recall what you did, but I explained how they work because the ONLY tests that mean anything are done in a live circuit.

    By measuring resistance source to drain across Q1, or Q2, while it...
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    By the way, is IC1 an actual 1458 IC? Or has it...

    By the way, is IC1 an actual 1458 IC? Or has it been replaced by a 4558 or later? A number of Marshall amps of that era were sensitive to IC type, and went unstable with newer ICs like 4558. I...
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    Again, I stand corrected. Thanks.

    Again, I stand corrected. Thanks.
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    OK, I did specify TO92.

    OK, I did specify TO92.
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    If those are TO92, I stand corrected.

    If those are TO92, I stand corrected.
  27. OK, I am not quite sure what we are doing... ...

    OK, I am not quite sure what we are doing...

    But this: A JFET is ON until turned OFF by a voltage at the gate. If you pick a JFET from your parts bin and measure resistance source to drain, you...
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    Tell me a Japanese TO-92 that is not ecb, and I...

    Tell me a Japanese TO-92 that is not ecb, and I will make a note of it.
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