Thanks everyone, great information,
The sure did look like DC blocking, so I guess they would be effective at
blocking RF as well. The symbol threw me into a tail spin though, try to find
that in a schematic symbol list!
I would have thought that 50 or 75v even would be just fine, but maybe they are
trying to build in a safety factor, or as you say, they don't come in smaller
values.
I think changing to DC would mean that the feed through caps couldn't be used
as wouldn't they block DC? I would have to change them to be more like a
bypass cap to shunt RF to ground rather than block DC. One of the things I
was thinking with DC is that it is very easy to wire up a simple voltage
regulator to dial in the filament voltage exactly. That is a bit harder with
AC. Once I have a nice DC voltage regulator for the filaments, I could then
easily power other circuits since (ideally) I will have stable voltage at the
tube. -- anyway, that is where I was going with that, if it makes sense.
I am adapting this project somewhat. One of my goals is to build it with the
one tube as it is specified, but I also want the capability to add another
3cx800 if/when I get one. To that end, should I run 4 feedthrough caps, or
can I just use the two and put the second tube in parallel with the first
through the same feed through caps?
Thanks,
Paul (KG7HF)
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