[Amps] 3CX800A7 Spares - cook them periodically?
Steve via Amps
amps at contesting.com
Thu Jul 17 13:14:43 EDT 2014
I understand the concept (although not the black magic) of parasitic
surpressors and chokes; but you raise the issue of damping resistances. What do
you mean by that? Where in a triode circuit would they go?
K1SG at AOL.com
In a message dated 7/17/2014 12:03:12 P.M. Eastern Daylight Time,
amps-request at contesting.com writes:
From: Amps [mailto:amps-bounces at contesting.com] On Behalf Of John Lyles
Sent: Tuesday, July 15, 2014 1:14 AM
To: amps at contesting.com
Subject: [Amps] 3CX800A7 Spares - cook them periodically?
> Anyone have a schematic for a burn in fixture?
If it were to be made, it would be a simple socket with blower/fan,
airflow interlock, filament power at a slightly low voltage with the proper
current limiting during turn on. More elaborate would be a tester that applies
plate voltage, and of course bias on the grid or cathode to prevent
excessively high beam current. As this is done, though, the chances of the tube
becoming an oscillator goes up, so 'stoppers' like parasitic chokes and
damping resistances would be considered. Its just not worth the effort if you
have the amplifier that can test them occasionally.
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