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  1. 56715 This is where I'm at right now. I'm a...

    56715

    This is where I'm at right now. I'm a bit unsure about everything between the relay and the driver. I'm thinking of just using G2 for everything after that first triode of V4. Also: I ran a...
  2. The nearest place is a Screwfix a few miles away...

    The nearest place is a Screwfix a few miles away and I don't drive. But I was in the area yesterday, so I picked some up...at a horrible price. Then, I got home and the stuff I ordered off EBAY had...
  3. Not a problem. I ran out of solder anyways. Got...

    Not a problem. I ran out of solder anyways. Got caught thinking I had plenty, and there's nowhere to buy it here. I have to wait for EBAY.
  4. Is 3.3 meg okay? The only 1 meg resistors I could...

    Is 3.3 meg okay? The only 1 meg resistors I could find were 5 watts. Ran out of daylight today. Or rather I used it for other things. But I Can still upload the demo of the problem. I'll just make it...
  5. Much simpler. Electronically all it needs is a...

    Much simpler. Electronically all it needs is a touch of assembly. It's just a mess. It's more a restoration than a repair, so...tough decisions to make. Like whether to re-cover. The cab has a burn...
  6. Well, I'll find out tomorrow. Either way, I'll...

    Well, I'll find out tomorrow. Either way, I'll post a video, cus I've recorded a demo of the problem. If the problem persists, it's back to diagnosing. After that, I got a 1978 Orange that's...
  7. Actually...COULD the grounding be the cause of...

    Actually...COULD the grounding be the cause of the issue I described? Filter caps supplying the first preamp tubes are grounded at the same point as those providing the plates of the output tubes,...
  8. I was looking for something like that on Ebay,...

    I was looking for something like that on Ebay, but didn't know what to call it. I might make something similar. I wanna do it tomorrow so I can't order anything. I could just cut something out of...
  9. Quick question: Since I'm limited to using those...

    Quick question: Since I'm limited to using those little solder tags for grounds, and space is limited, I'm thinking of just bolting down 2 or 3 of them and connecting them together with a ring of...
  10. I'll check again. Maybe I didn't check on the...

    I'll check again. Maybe I didn't check on the jack itself, since I was trying to determine which of the star grounds everything was connected to.
    Ah. Yeah, it was on the jack.
    Yeah, y'all can can...
  11. Nah, I never use my name on the internet. But I...

    Nah, I never use my name on the internet. But I was in a band with a guy called Marc Davis, and I figured Dark Mavis would be a cool name for a character in an urban legend. Once I got all the...
  12. Presence control is just adjustable negative...

    Presence control is just adjustable negative feedback, right?
  13. 56540 Here's what's in the amp. There's a lot of...

    56540
    Here's what's in the amp. There's a lot of stuff connected to the middle ground point, that probably shouldn't be. And I think the last 2 filter caps should be grounded at G1. The next one -...
  14. 56539 So here's what's in the amp. The points...

    56539

    So here's what's in the amp. The points marked #1, #2 and #3 are the existing grounds. #1 and #3 are tricky to get to without moving other stuff. #1 is under a transformer, and #3 is under...
  15. Then I think, what I need to do first is mark the...

    Then I think, what I need to do first is mark the current ground points (Not things like shielded wire grounds) on a photo or layout drawing of the amp, and label them. And then mark each ground on...
  16. Have you ever started reading about something and...

    Have you ever started reading about something and wished you hadn't started? There seems to be an awful lot of people confidently saying that the things that other people are confidently saying, are...
  17. Okay, so it turns out the problem is not fixed....

    Okay, so it turns out the problem is not fixed. But I can turn the amp up way, way louder before it occurs than before. So I'm thinking it's a lead dress/grounding issue. I think I need to look at...
  18. I thought about taking the board out and re-doing...

    I thought about taking the board out and re-doing all the solder connections, then giving it all a good isopropyl wash, but the tube sockets are mounted from the outside. I'd have to desolder every...
  19. There seems to be a problem. And the problem is...

    There seems to be a problem. And the problem is that the amp is working now. I think, when I tested it with that electric whisk thing that what I heard wasn't the old problem. It was just an amp...
  20. Okay, so here are idle DC voltages for the preamp...

    Okay, so here are idle DC voltages for the preamp tubes and filter caps. Grid voltages were too small to measure accurately. I noticed there was a lot of popping and scratching when I was trying to...
  21. So, I found another discrepancy while measuring...

    So, I found another discrepancy while measuring the voltages again. The 3.3M resistor (At least that's the value on the schematic) that's connected to the Grid of V1, is 1M in the amp. I know it...
  22. I think that was just the way the tube was...

    I think that was just the way the tube was oriented. I was kinda hoping rewiring would sort it, but at least now I know the circuit and I have more room to poke around. I'll measure all the voltages...
  23. So...here's a video. Yeah, the dramatic moment...

    So...here's a video. Yeah, the dramatic moment where the amp is turned on for the first time is totally staged for the video. :D I never filmed it when I actually did it, so it's more a dramatic...
  24. It was in the studio with a bunch of other stuff...

    It was in the studio with a bunch of other stuff that makes weird noises. A TV remote also makes a cool noise through a guitar pickup
  25. Well, I was going to post a full diagram of the...

    Well, I was going to post a full diagram of the actual wiring in the amp, as a diagnostic aid, but it seems that the amp is now fixed. I can't be 100% sure, cus I was testing with an electric...
  26. Ah, good. Then, everything is pretty much correct...

    Ah, good. Then, everything is pretty much correct now. I don't like that the auxillary transformer of the preamp filaments, and the channel switching relay, bypass the power switch, but I can just...
  27. So the wiring in my drawing is correct, and the...

    So the wiring in my drawing is correct, and the schematic just draws that stage upside down to avoid having to draw wires crossing each other?
  28. Quick question: This is the phase inverter/driver...

    Quick question: This is the phase inverter/driver as it is actually wired in the amp:
    https://imageshack.com/i/pnkCuAPBj
    And this is the schematic:
    https://imageshack.com/i/plhG1ToGj

    The second...
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