RE: Tube watts & volts
Max plate voltage is normally given in DC and for an 811A that is 1500v.
However, it is possible to use self rectification with AC on the plate and
obviously peak to peak would be the safe limit. But I wouldn't worry
if you exceed this somewhat (how much is somewhat? ..experiment until
you destroy the tube). Plate current on an 811A is 175ma, thus they are often
put in parallel to handle more current.
I have one coil that uses 3 X 811A at 1300v -at- 500ma that produces a
beautiful 8 to 10 inch corona. These are cheap, good triodes great for
a first tube project or experimental work that can be abstracted to bigger
John W. Gudenas, Ph.D.
Department Chair of Computer Science and Mathematics
Aurora University, Aurora IL 60506
Office: 630-844-5539 Fax: 630-844-7830
From: Tesla List [SMTP:tesla-at-pupman-dot-com]
Sent: Thursday, July 01, 1999 11:15 PM
Subject: Tube watts & volts
Original Poster: Grayson B Dietrich <electrofire-at-juno-dot-com>
I'm a little confused on two areas,
Is the voltage rating of a tube, say, 1500 for an 811-A, peak or rms?
The other question I have is the wattage an 811-A can handle. In the back
of Brent Turner's book, it is listed as having a plate wattage capability
of 65 watts, but I've seen circuits, specifically two push-pull
oscillators and a driver for a sonic bath, that use them at over 200
watts apiece. ??? I'd be glad for a little help here, since I KNOW there
is someone with the answer out there...
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