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In Reply to: RE: What capacitors to buy to refurbish old RCA amp? posted by maxhifi on February 09, 2016 at 16:58:34
For vintage Fender amps, I've been using Yellow or Red Jupiter caps. Yellow for blackface and silverface era amps (1960-80s). And Red for woodie and tweed eras (1940-50s).
Red ones sound pretty close to original 1950s Astron caps. The Yellow ones have a tone similar to the original blue MOLDED caps.
Russian metal case K40Y-9 are excellent coupling caps, too.
As for 'lytics, I've stuck with Sprague Atoms or F&T. Need solid reliability in the PSU and bias circuits.
Edit: I agree with Vinnie, for 90% restos... OD are fine caps. Maybe a tad brighter tone than some of the boutique caps. But, these last forever. Very good quality. Some boutique caps have prematurely failed (leaked DC) on me.
Edits: 02/09/16 02/09/16 02/09/16Follow Ups:
Those are all attractive looking options. My only worry with the Russian ones, is that they are already 25 years old. Maybe they can last a long time, but I have some experience repairing Soviet made equipment, and their electrolytics are always bad, almost as a rule. Hopefully the paper ones are better! They sure look cool though
I have had many of these leaky brand new (NOS)
I have had many of these leaky brand new (NOS)
the paper in oil?
I plan on testing them each for leakage before use
Yes, russian PIO's
I have one right now in my older DIY amp squeaking after testing 3 yrs ago
My plan is to let them sit at 400VDC with a bench power supply and measure leakage with my Simpson 260 on the 50uA scale, before I go ahead and put them into the amplifiers. I don't have an actual capacitor leakage tester but I think this improvisation should be good enough to check things out.. got plenty of old wax caps and new orange drop/dip types to use as a baseline.
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