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In Reply to: RE: What capacitors to buy to refurbish old RCA amp? posted by maxhifi on February 10, 2016 at 12:24:45
I have several
I have a pair of 9358s,I have one of the 807 versions that you see in the photo,and i have four of the M-12182s which are the 6146 amps..I converted one pair to 6550s but I really think these amps have a lot more potential and I was see what they can do.
The 9358s and the 807 amp in the photo has round output transformers that are high frequency limited from what I saw on the sweep out of the amps.
Nobody ever went broke underestimating the intelligence of the American public
H. L. Mencken
Follow Ups:
Nice collection! I didn't realize the round output transformers were that limited, I've wanted something including them for a long time - my MI-12188a's are very wide range. I also have an MI-12202B which I have set up to do TV sound. It's very restricted above about 8k, but I like having an RCA amp from 1940 included in day to day life! If I see one cheap enough on eBay I want too get an appropriate MI series speaker to go with it.
The 6146 amp I believe is the successor to my amplifiers - I think the substitution to 6550 was an excellent idea. If they have similar transformers I would agree there's tons of potential there, especially with four of them!
Here is the poly cap you can use in place of the 30uf lytic
On the driver,there are nice high impedance CCS or even an enhancement mode mosfets you can use that will give the 6SL7 an easier time of driving the outputs.I know it works by itself but keep in mind this is 1940s technology and they weren't using it for hifi.. You're allowing the 6SL7 to drive into a higher impedance load and it won't add a sand type sound as there is no gain but you can try a few things.
Nobody ever went broke underestimating the intelligence of the American public
H. L. Mencken
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