Jeff Edmonson wrote in a message to Bruce LeGrande:
 > go with the larger VDC ratings (above 250), and I've
 > heard that a cap as low as 47uf might be OK - but what about
 > going the other way higher than 100 (ie 220uf) ?
 JE> You can always go higher on capacitance, for filtering.
Thanks Jeff..  The the 220uf value should be OK, and should
provide better filtering.  I imagine that when this rig
(probably a R-4A as well) was built, the 100uf might have
been the best choice for size design limits, but in the
past 10 (or so) years - I believe components of the same
ratings have probably gotten much more compact since then.
 JE> Realisticly, probably there's only one section of the tubular thats
 JE> going/gone out. Replacing it with three seperate caps might be
 JE> alright, but I wish you luck...  My R-4A didn't lend itself to that
 JE> much room.
Since I figure they are ALL getting fairly dry, I thought I'd
just GA and replace them all now and perhaps negate problems
later on... ;)
 > The physical size of the new components (18x32mm)
 > [DxL] doesn't seem to present any problems.
 JE> Call me an ol' phart, but I don't know what 18mm is...
OK You Ol' Phart!   Actually according to QRZ, you're
a couple years my junior, so I guess I'd better take it easy :)
 JE> rough calculations show that 18mm is somewhere around 6 inches. 
According to my ruler, it's about 3/4" (MM x 0.04 = inches)
 JE> 100mm in one Meter, right?
Must be a thou...  100cm per meter, 10mm per 1cm
 JE> I simply -don't- believe you've got the room for that, inside the
 JE> Drake R-4. 
 Not EVEN with an RME would I have THAT much room .
What do you think about the power ratings ?  Should I go up
to the higher ones if I increase the capacitance ?
Voltages in the PS curcuit is 150-180 VDC.
Sincerely,
           Bruce - kb6lwn@juno.com - http://www.qsl.net/kb6lwn
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