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I am restoring a Stromberg AU-42 - 6L6G question

I am restoring a Stromberg AU-42 and I want to keep the original can cap look. I cannot find a 50/40/30 in order to keep the 50uf cap at the cathode side of the 6L6 outputs. The circuit is push/pull (2 6L6’s) and the cathodes are tied together to 50uf/50v parallel to 200 ohm resistor to ground. I believe this is the current source for the 6L6’s. I can find a 70/40/40 and a 80/40/30 can cap. I am wondering if I can increase this 50uf on the 6L6 cathode to 80uf or 70uf. My gut says this will be okay although in the back of my head, more capacitance means more current on demand which my gut says should still be okay. I don’t want to heat up the 6L6’s. Any advice would be helpful. I really do not want to use individual caps but if I have to I will.

Thank, Tom
Epsom Repair Depot

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tommyboy60

Showing 3 responses by oldhvymec

oldhvymec
5,101 posts
 
Where is rodman99999? He might have an answer. 15% increase he told me, got the same from Samra on 6L6 PS upgrades on Macs and Citations II.  Some 6L6s sure can take the punishment.. Tough valve.

Gut the can and put exactly what you want in it... I've split bumblebees and loaded them with new caps.. Customer wanted original look, but better caps... Same with MC30-60. Gut the can and build them the way you want, reseal the can.. No need to add extra cans inside then.

Just a thought.

Regards
oldhvymec
5,101 posts
 
They made everything.. 98 and 102 stromberg down draft.. carbs. lot of those on the old flatheads...6 singles... what a mess, what a LOOK...
Home steam radiators, hot water bottles... Car seats.  Mining air pumps...
LOL

Regards
oldhvymec
5,101 posts
 
You mean a by pass on a filter cap? They are usually pretty small right?
like .47 .22, you know .XXX  not 50 or are you talking filter caps? I agree you could go up a bit.  I'm no designer, lol, but I'm one tinkering fool sometimes.. It's the nosey mechanic in me... Can't help but think about it...  Through the years I've had to do a lot of repair work on heavy equipment, a tube amp it pretty simple in comparison. Getting it to sound the way YOU want is the real trick... You sound picky.. I'm very much so.
Never walked away without a fix, never gave up...I'm one of those for types for sure..

Orange drops, man those thing last 100 years..Silver micas, what are you going with, the same, orange drops and silver micas? MC225 use orange metalized drops, very special sound...I hate messing with them, I just usually test, them. I've found a couple in 35 years... I hate to lose that sound..

Let's see if rodman99999 will chime in..  Do you have a schemo?
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