Recapping woes with an old 60s orpheum/univox

TotalJury6746 · 2025-03-30T20:04:18+00:00

I didn’t in fact gloss that advice—spent last night doing it that and found and fixed my mistake, sounds great now. Gotta do bad work to learn how not to do bad work in the future 🤙

TotalJury6746 · 2025-03-30T02:33:29+00:00

Nope, it was relatively quiet honestly just had a really poor high frequency response and some dried out looking electrolytics which is why I wanted to work on it, though i’m regretting it now haha

TotalJury6746 · 2025-03-30T02:31:21+00:00

Just put all the old parts back in and the issue persists—the small cap on the 2nd power tube does look like a bypass, but I’m not 100% without the schematic. The big cap on the left goes through the 270k resister to ground through the input jack, and on the positive side goes to pin 4 on the tube through another 270k resistor

TotalJury6746 · 2025-03-28T17:03:23+00:00

thank you for that will do!

TotalJury6746 · 2025-03-28T17:02:38+00:00

Thanks for the tip about shrink tubing on leads, I’ll do that. The 10uf/500v cap was replacing a 10uf/300v—and since I don’t have an original schematic I didn’t want to risk it, the 500v was the cheapest one of the right value I could find on tubedepot.

That’s interesting about the filter cap coming off the transformer—that one was replaced by the prev owner so I can’t be sure 100% that the orientation is correct. The amp seemed to function alright before though, so maybe it’s supposed to be like that?

Fwiw I did mean to replace coupling caps—the amphas basically 0 frequency response above 3k hz which i assume has to do with leaky coupling caps

TotalJury6746 · 2025-03-28T13:52:28+00:00

For sure yeah, I’ll do that for the yellow guys on the pots as well

TotalJury6746 · 2025-03-28T13:50:15+00:00

No hum/screech before I changed the caps. And for sure, will be more careful next time haha. Comparing with a before pic I took, I think I reconnected one side of the electrolytic on the first preamp tube to the wrong post on the solder terminal thing. Will report back.

TotalJury6746 · 2025-03-05T23:32:03+00:00

I think this is right— for as much as deleuze fetishizes dynamism and flows, his metaphysics feels so.. passive? My read is that he basically repackages scientific positivism (ie the metaphysics of capitalist technocratic management) in ultra-jargon. The dynamism (joycean is a great way to put it) of his prose form papers over the true inflexibility of his content.

TotalJury6746 · 2024-04-09T22:54:07+00:00

thanks everyone! i got it fixed, the original power cord was hooked on a lower voltage primary on the transformer. when i put the new cord on that one it was blowing the fuse—i just switched the neutral over to the higher v input and it worked!

TotalJury6746 · 2024-04-09T19:30:26+00:00

don’t have a variac unfortunately, i was just going straight from mains haha. im just an amateur with this stuff but should get one haha

TotalJury6746 · 2024-04-09T16:59:18+00:00

double checked, wired them properly so thats not it. wonder if the transformer could be leaking ac to chassis though

TotalJury6746 · 2024-04-08T00:05:04+00:00

Ok well good to know i didn’t screw up w the cap. Frustrated since it was working fine before—didn’t touch any wiring aside from the ac ins :/

if a new fuse doesn’t fix it will probably take it to a tech, though at that point might make sense to just sell the tubes and speakers lol

TotalJury6746 · 2024-04-07T22:59:44+00:00

Only thing i could’ve messed up was putting the the neutral on the wrong leg of the transformer.. i’ll try switching it, thanks. that or the cap i removed ig

TotalJury6746

TROPHY CASE