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  1. Replies
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    The article you cite shows the guy installing a...

    The article you cite shows the guy installing a hum balance pot on the heater supply. But he also shows the original schematic which has a grounded center tap on the heaters. If you install a hum...
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    101

    I can't imagine anything more reliable than a...

    I can't imagine anything more reliable than a standard Western Union splice, soldered and tubed.
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    71

    This sort of thing comes up more often than you...

    This sort of thing comes up more often than you might think. People often write in claiming a bunch of resistors in their amp measure very low. It is because of other circuit paths in parallel with...
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    Totally has to do with the winding. From the two...

    Totally has to do with the winding. From the two end terminals of the switch you have the winding. Whatever its resistance might be, it will be low.

    "Continuity" readings are for guys wiring...
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    101

    It is a WIRE, of course you can extend it. It is...

    It is a WIRE, of course you can extend it. It is just a wire. SPlice a longer wire to it and cover the splice with some heat shrink tubing. If you want to be cool about it, use the same color...
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    I had fun with them, watching the patterns, and...

    I had fun with them, watching the patterns, and then one magic day I coupled the circuit to an amplifier with a cap. Oh the glorious buzzing and whirring.
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    If you would post or link the schematic of what...

    If you would post or link the schematic of what you are building it will be much easier to comment on.
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    149

    I discoverd relaxation neon oscillators early on....

    I discoverd relaxation neon oscillators early on. A bonus was when I discovered I could parallel sections off the same supply and they would modulate one another.
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    Perfect opportunity to educate them that other...

    Perfect opportunity to educate them that other forms of oscillator exist.
  10. Well, the Squiers are chip amps, so there is no...

    Well, the Squiers are chip amps, so there is no adjustment to make. But certainly respect the mains wiring.
  11. Welcome I was an authorized Fender repair shop...

    Welcome

    I was an authorized Fender repair shop for decades, and I have a Squier Champ 15 schematic.

    Fender always provided schematics for amps on the do not repair list. Do not repair means...
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    Intermittents are always the hardest to solve, by...

    Intermittents are always the hardest to solve, by their nature you can't sit there and watch it in failure mode.
  13. Replies
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    I don't see a schematic. The various machines I...

    I don't see a schematic. The various machines I saw had DC adaptors.
  14. Replies
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    We already know the problem mode is off and on -...

    We already know the problem mode is off and on - no pun intended. So we just use the amp as you have been, leaving the scope connected. If it never screws up, I am not sure what to conclude, but if...
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    I just went looking at photos. Some are listed...

    I just went looking at photos. Some are listed on Reverb for sale. One has a nice close up of the power adaptor. It says 24v DC 100ma.

    I looked at several more listings and all said 24vDC...
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    Open it up and meter the power jack, it it still...

    Open it up and meter the power jack, it it still 9v? Assuming it says 9v on the machine. Also check current rating.
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    OK, you turn it on, it acts up, THEN you touch a...

    OK, you turn it on, it acts up, THEN you touch a probe to it, and it gives up. Does it do this with a meter instead of a scope?

    In either case, connect the scope when the amp is off, NOW turn it...
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    Since the company has systems capable of work...

    Since the company has systems capable of work from home, it seems they might have an IT guy. Can you not contact THEIR IT people and ask assistance?
  19. These are common enough pots. These are not the...

    These are common enough pots. These are not the old Crate pots which were unique. I have altered them with no hassle. If the new pot shaft is too long, cut it off. If it needs a D-shaft, cut away...
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    It either runs at normal cassette speed, which I...

    It either runs at normal cassette speed, which I think is 1-7/8 ips. Or it runs at twice that. SOme models have a button to select hi or lo speed.

    The gear wheels have grooves or cams the...
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    You have mentioned pay, but pay isn't the issue. ...

    You have mentioned pay, but pay isn't the issue. We generally post up anything we have.

    The motor and transport operate at one speed. It could be the wrong speed, but whatever speed it decides...
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    That^^^ If I had a bunch of values, I'd put...

    That^^^

    If I had a bunch of values, I'd put the largest one first. But you are talking 16 versus 22, and that is such a tiny difference as to not matter.
  23. Thread: BJT buffer help

    by Enzo
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    151

    Your cap sits unterminated? The emitter voltage...

    Your cap sits unterminated? The emitter voltage wants to charge the cap, but without a ground reference on the other end, the cap cannot charge, meaning the voltage will be the same. That DC...
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    The 6vAC heater connectors are under spec and...

    The 6vAC heater connectors are under spec and burn up. SOlder the wires directly.

    I never encountered rectifier failure, the load on each supply is just 150ma for tube heaters. Add a few...
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    I just checked my dealer support site, and that...

    I just checked my dealer support site, and that half page is missing there too. I know my paper copy is intact, but it is not accessible.
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    That is weird, it didn't used to be. The layout...

    That is weird, it didn't used to be. The layout drawing is intact, we can draw out the circuit from that, there is not much on that board.
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    Calling sometimes works and sometimes not, but it...

    Calling sometimes works and sometimes not, but it is a step many neglect.

    4066 is a quad switch. Used to be the 4016 was what we used. 4066 is a common CMOS chip. it has four independent...
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    For future reference, try this file.

    For future reference, try this file.
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