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  1. Replies
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    I hate talking on phones, too! To the best of my...

    I hate talking on phones, too! To the best of my recollection, it started when I had my own business. At one point it got to where I was spending half a day on the phone. You can't get much work done...
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    Negative temperature coefficient.

    Negative temperature coefficient.
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    I was doing TV repair in the early 90's including...

    I was doing TV repair in the early 90's including a few house calls. I remember walking up to a particular customer's door. He opened the door already pitching a fit and cussing at me. I politely...
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    54377 ...especially knuckleheads.

    54377

    ...especially knuckleheads.
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    It's a switching supply running at about 75Khz...

    It's a switching supply running at about 75Khz per specs, so you shouldn't have much low frequency ripple at the output. Do you have the primary ground completely isolated from the secondary ground?
  6. This place says they have one (down the page a...

    This place says they have one (down the page a bit), but you have to email for a quote and who knows what they'll charge for it.
    ...
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    Probably too late, but I'd have measured the...

    Probably too late, but I'd have measured the output emitter resistor voltage drop on the good channel and matched the repaired channel to that. It would still be a good idea to check that there isn't...
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    Step 1 = Find schematic and upload. :)

    Step 1 = Find schematic and upload. :)
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    Are you talking about the dual diode rectifiers?...

    Are you talking about the dual diode rectifiers? Not sure what you mean. If that's your question, you check them like any other rectifier. It's just 2 of them in one package, so test both of them.
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    Just pay attention to the basing diagram.

    Just pay attention to the basing diagram.
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    Is there a substantial enough heatsink that you...

    Is there a substantial enough heatsink that you could just use a TO220 5v reg? If so, I don't see why that wouldn't work as long as current capability is at least 2 amps like the original part. You'd...
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    That diode package is just 2 schottky diodes in...

    That diode package is just 2 schottky diodes in one package. You should be able to just check them as 2 separate diodes- low resistance one direction and high the other. Is there AC all the way to...
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    I used to be a Mackie service center. I don't...

    I used to be a Mackie service center. I don't recall ever seeing shorted outputs in those amps- at least very rarely. The problems I saw were ribbon cables- not the issue in your case. The other was...
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    Can you share the entire power supply schematic?...

    Can you share the entire power supply schematic? It's hard to help without knowing what you're working on. Sans that, it sounds like it's trying to start and then going in to protect- cycling. If...
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    Here's the datasheet. ...

    Here's the datasheet.

    https://www.promelec.ru/pdf/FSDH0265RN.pdf

    It's a PS switching IC. Everything I can find says it's discontinued. The only place I could find it was on eBay from China,...
  16. I agree. Not to be a stickler, but that's...

    I agree. Not to be a stickler, but that's impedance- not resistance.
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    The Hughes & Kettner Red Box DI is a good one.

    The Hughes & Kettner Red Box DI is a good one.
  18. We can build our own weapons from surplus...

    We can build our own weapons from surplus electronic junk. ;)
  19. What are the collector voltages on Q4 & Q5 with...

    What are the collector voltages on Q4 & Q5 with diodes in vs diodes out?
  20. I saw the update. If it works, it works. No...

    I saw the update. If it works, it works. No problem. I'm just not sure where the "K" came from. I saw it as 100 ohms- not K ohms. It's likely just a simple voltage divider circuit, so just about...
  21. I read that as single (1)/linear taper (B)/100...

    I read that as single (1)/linear taper (B)/100 ohm. Could certainly be wrong. If in doubt, have you tried taking apart the pot and putting your probes directly on the track? Often it's just the rivet...
  22. Here's a download link for the "non-MK2" version....

    Here's a download link for the "non-MK2" version. Maybe it will be similar enough?

    https://elektrotanya.com/rcf_art312a_se515644_b_sch.pdf/download.html
  23. Yep. I hope he's in good health. I always enjoy...

    Yep. I hope he's in good health. I always enjoy his posts- lots of awesome builds.
  24. Thread: PT spludge

    by The Dude
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    IMO, it's potting wax. Hard to tell for sure from...

    IMO, it's potting wax. Hard to tell for sure from a pic. Some wax leakage like that is ok. You see it quite often. On the other hand, if you see it boiling out of there, you could have shorted...
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    It's right there in the service manual (post #4)....

    It's right there in the service manual (post #4). Right off the AC line. It's an NTC thermistor. There's even a parts list with a part number for you.
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    I won't argue about specs, but I'll add this:...

    I won't argue about specs, but I'll add this: Anyone ever look at the voltage rating on a typical Fender standby switch? :tape:

    Just sayin', if it works there, it should be fine for a...
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    https://supportloudtech.netx.net/loud-public/#/ass...

    https://supportloudtech.netx.net/loud-public/#/asset/18140
  28. Thread: LED question

    by The Dude
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    If your ordering, you may want to get some blue...

    If your ordering, you may want to get some blue ones, also. As I said, they're much more visible in direct sunlight.
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