Re: Question for John about the 5-125B and the 810

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>" <cwillis-at-guilford.edu>


Hey Rick,

Your 810 will do fine in a tesla coil, I have used them before and they work
great.  You got a really good deal on that new tube, by the way.  I don't have
any experience with the 4E27A, but from the specs in the RCA book it looks like
a potentially good one.  Probably quite similar to an 813 for tesla coiling
purposes, but it has an even higher (4 kV) maximum plate voltage.  About the
capacitor:  a good capacitor in a conventional coil will be a good capacitor in
a tube coil as well.  This includes MMC's (my favorite in both tube and
conventional coils).  Micas probably come to mind because of their historical
use in big tube circuits, but (in my experience) they have no advantages over
an MMC and are dreadfully hard to find at a good price these days.

Carl

"Tesla list" <tesla-at-pupman-dot-com>
10/30/2001 08:08 PM MST

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Subject: Question for John about the 5-125B and the 810


Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<Robynsaddiction-at-aol-dot-com>

Hello,

     John or any others who might know. I was wondering if only one CETRON 810
would work in a small tube coil, because I just got one for $10.00 new. Also, I
wanted to know if there was any chance that an RCA 4E27A / 5-125B tube would
work, because I have the chance to get four of those NEW at $10.00 a piece.
Thanks guys! Hope someone knows something. Also, do the capacitors in a VTTC
have to be mica, or can they be other types of capacitors?

                             Rick Harris