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RE: Fixed! Yay!

Posted by Jim McShane (D) on November 25, 2014 at 19:37:20

In Reply to: Fixed! Yay! posted by FenderLover on November 25, 2014 at 18:27:45:

FWIW, if the B+ downstream from the choke was nominally 470 volts with a 117 volt primary it would be just under 500 volts at 124 volts on the primary. If the tubes weren't fully warm and drawing their normal current then if the standby switch was flipped too soon that could cause the caps to see over 500 volts. They are rated for 550 surge so that shouldn't do any harm, but note that the (2) 100 uf/350 volt B+ caps are in series so you have a 700 volt effective rating. They did that for a reason.

500 volts for those 22 uf caps seems pretty close to me. I'd be tempted to use a couple 47 uf 350 or 400 volt caps in series there just 'cause I'm a chicken! 23.5 uf at 700 or 800 volts sounds good to me.

Just my thoughts...

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