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Re: [TCML] The Practical construction of VTTCs

According to the Svetlana Electron Devices datasheet, the 572B is designed as a "drop-in replacement" for the 811A. This means that the power and voltage levels should be respected. Maximum plate input is 600W per tube with a maximum plate voltage of 2750V. If you are running anywhere near capacity, forced-air cooling is a necessity. Unless you are going to stick with the schematic you referenced, I would strongly recommend obtaining the 572B datasheets (download pdf) AND getting a reprint of a reference book such as RCA TT-4 Transmitting Tube Manual which explains how and why vacuum tubes work and design considerations (in high school-level language).

Running two MOTs in parallel will just mean they are not being worked as hard, because unlike an SGTC, the tube and circuit parameters determine the useable power, not just the transformer.
Running tubes beyond their capacities means much shorter life spans although not nearly as bad as the millisecond deaths of ICs.

Hope this helps,

Matt D 

-----Original Message-----
From: Neon Tesla <neontesla@xxxxxxxxx>
To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
Sent: Sat, Jul 14, 2012 1:01 pm
Subject: [TCML] The Practical construction of VTTCs

            I recently purchased a matched set of 572B
tubes for a 3" VTTC and now I realized that there are
not nearly as many pages on the practical
construction of VTTCs so now i'm stuck. I was planing
to use both tubes and parallel two MOTs, then use an
oil filled secondary. I know the basics of a VTTC but
I have many questions.

            Firstly I wonder if
values would
need to be upped to handle two MOTs? Second I was
wondering if the MOTs would need a ballast or rather
the tubes would draw the required current and not
pull too much current. Any help is greatly appreciated,


Don't lower your expectations, raise the voltage !
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