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echo: audio
to: BONNIE GOODWIN
from: JOHN BOYD
date: 1996-08-21 22:48:00
subject: High voltage caps

BG>Hi John,
Hey Bonnie!
BG> Don't have docs handy, but didn't the Dynaco Mark III use a
BG>multisection 600 volt cap with a number of 20 uF sections?
30/20/20/20uF @ 525VDC, according to what I have sitting here.
BG>You are talking the typical power supply ripple smoothing, right?
Yeah, the usual cap input pi filter, but I'll be changing things around a bit 
further "upstream" on the input/driver boards.  I've found that regulating 
the output tube supply sometimes compresses the sound a bit. Tight power 
supply regulation on the input/driver stage, however, is almost always 
beneficial as long as it's low-Z and quite stiff.
BG>Give me an exact description of what you need in voltage rating,
BG>sections and capacitance required..
I can't be exact right now as I haven't nailed down what I'm gonna actually 
do to these guys.  Probably something in the 550VDC range, any capacitance, 
twist-lok.  I favor photoflash and LASER discharge caps for power supply 
areas as they tend to be low-Z/high voltage, and relatively inexpensive.  The 
twist-lok will go up on top of the chassis for aesthetic reasons, the rest of 
the caps get stowed underneath - also for aesthetic reasons.
BG>Come to think of it.. suitable caps for tube equipment are getting to
BG>be rarer than hen's teeth an probably quite expensive nowadays!!
... indeed...  And those that got 'em *know* it, too.
Tootles...
J.B./2
 * SLMR 2.1a * "We are Windows '95 of Borg, you will be..."......
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