Re: Regulation for Filament Voltage on 833A Tubes

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

Original poster: "Crow Leader by way of Terry Fritz <teslalist-at-qwest-dot-net>" <tesla-at-lists.symmetric-dot-net>

Is this voltage you measured at the end of the transformer leads under load,
or open circuit with no load?

KEN
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Wednesday, May 21, 2003 12:22 PM
Subject: Regulation for Filament Voltage on 833A Tubes


 > Original poster: "Mccauley, Daniel H by way of Terry Fritz
<teslalist-at-qwest-dot-net>" <daniel.h.mccauley-at-lmco-dot-com>
 >
 > I finally got my 833A VTTC up and running and I noticed that the actual
 > filament voltage coming from my
 > 10V, 10A filament transformers is about 11.6 VAC.
 >
 > The nominal spec for the 833A tube is 10V +/- 0.5V  (either AC or DC).
 >
 > Common sense always says you should abide by the datasheet and that
 > exceeding this limit would either be destructive to the tube, or reduce
 > optimal performance.  However, I have very limited experience with vacuum
 > tubes so I don't know how critical
 > this actually is.
 >
 > What are your thoughts?  Okay as is, or do I need to control this
precisely
 > via variac???
 >
 > Thanks
 >
 > The Captain
 >
 >
 >