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MRA5-L6 Seeburg 'R' - Capacitor discrepancies

Posted: Mon Jan 25, 2016 10:41 pm
by Steve_B
I'm getting ready to replace the caps on my MRA5-L6 and I have a question about the Seeburg schematic vs. Seeburg parts list.
Before I install any of the caps I'd like clarification of the following:
Cap C16: the parts list indicates 1 mfd. 200v. paper; the schematic shows it as lytic.

Cap C23: the parts list indicates 10 mfd. 50v. lytic; the schematic shows it as paper.

Which is correct for each cap?

Also, Cap C36 appears on the schematic but is not used in my amp (s/n 72,921).
What was its original purpose.
Thank you, Steve.

Re: MRA5-L6 Seeburg 'R' - Capacitor discrepancies

Posted: Tue Jan 26, 2016 12:07 am
by Ron Rich
Hi Steve,
It appears that they made many changes in this amp during production--and the printed schematic was not able to "keep-up" ?
One I know of is to the right of the 6SL7--R-59--the "note" says, "see note 6"--it should say say "see note 7"
For C-16, I believe that the schematic merely is showing the "polarity" of that cap, not an indication it's a lytic ( "Paper"types were marked for polarity, at the time this schematic was drawn). C-23, well yep--I think the parts list is correct--
C-36--You got C-37 ?? I think, they meant to say 37 replaced 36 ?? It is some type of a noise bypass circuit, as I read it--not too good on tube circuits. Ron Rich