RE: [TCML] 833A VTTC Novice

["Richard Schmuke" <rdj@xxxxxxxxxxxx>]

Keep the voltage at 10V and not over. The only way to damage the filament is
to have too high of a voltage or too heavy of a transformer. If you had a 30
0r 40 amp capability transformer then when you first light up the filaments
they are cold and draw excessive current. This will shorten their life. That
is why a normal set up used the same amp transformer as the tube requires.
If you want to prevent this problem look up , soft start filament.
Rich, Kd0zz

-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
Of Wm A Tickhill
Sent: Friday, November 18, 2011 3:18 PM
To: tesla@xxxxxxxxxx
Subject: [TCML] 833A VTTC Novice

Thanks to everyone for responding to my inquiry re (2)833A Vttc Specs.
I am gathering parts for an initial hash up, and I have a few
questions. Two 833As require 20 amps @ 10 volts.
 I have rewound a MOT to serve as the filiment transformer, the output
is 10.55 volts @123 volts in ( I have Variacs ). I tested using the
series resistance of x00 feet of
#14 awg wire, @19 amp current draw the voltage drop is .2 volt.

1  Is this voltage drop excessive, should I remove the shunts?

2  How long should the tubes burn in, and do I simply power up the
filiment supply and let them cook?

3  Should I scrap the MOT ( unbalanced ) as filiment transformer idea?

Thanks    William A Tickhill
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