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In Reply to: RE: Cathode Bypass Cap MC60's posted by deafbykhorns on March 22, 2015 at 16:55:09
You are speaking of the 3.3k bypass that comes off the secondary feedback winding and that has to be 100uf because it affects the global FB loop..Just use a non polar muse cap there..That has to be 100uf if that's bypassing the 3.3k..Make sure the values are the same.It is in series with the 68 ohm and that resistor critical to be within 5% of that 68 ohm value.
Nobody ever went broke underestimating the intelligence of the American public
H. L. Mencken
Follow Ups:
It's been quite some time but I remember reading about a mod for the MC60's that gave a bit more gain.
Was that your post?
I went from a 12AU7 to a 6CG7 in the phase inverter and that lowerd distortion a bit and made it more linear. I never messed with gain but power goes up when you do a rebuild with better caps and it's much more quiet.
I used an all film cap supply in the Mc60s and the Mc30s but I do the McShane Citation upgrades to all the Mac amps which has the same effect of more power and lower distortion.
Nobody ever went broke underestimating the intelligence of the American public
H. L. Mencken
I live right around the corner from your buddy Jim C. in Jacksonville....
Edits: 03/25/15
That's fine bit right now I can barely speak.I have swollen lymph glands in my throat and it hurts to speak.
Nobody ever went broke underestimating the intelligence of the American public
H. L. Mencken
I was thinking about the 6CG7 mod, seems like an easy mod and just requires some heater wiring changes. Looks like the curves are pretty close and voltages are within spec
I think my 5U4's may be a little tired so I might try a good set of rectifiers.
Edits: 03/24/15
"I think my 5U4's may be a little tired so I might try a good set of rectifiers."
NOS GE 5U4GBs WILL do the job for you, without moving to the poor house. The current production EH 5U4GB is another nice cost effective option.
Russian and Chinese ST bottle 5U4s are manure . :> ((
Eli D.
The JJ 5U4G ( Antique Electronic Supply ) is very good also Eli.
hell, I don't go to places like Walmart because of it.
Someone on AA has a signature here "Buy Chinese, bury freedom" or something like that. I'm a firm believer of that statement!
Yes, thats the cap, I assumed it was part of Rk bypass as well.
Would this reduce the gain of this stage with the lower value if its part of the FB network?
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