Re: [Amps] 3CX800A7 Spares - cook them periodically?

["Carl" <km1h@jeremy.mv.com>]

The resistor is the other half of the suppressor. The 3CX800 is a very 
stable tube and is gentle on a basic 2W carbon resistor.
Carl
KM1H


----- Original Message ----- 
From: "Steve via Amps" <amps@contesting.com>
To: <amps@contesting.com>
Sent: Thursday, July 17, 2014 1:14 PM
Subject: Re: [Amps] 3CX800A7 Spares - cook them periodically?


> 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?
>
> Thanks,
>
> Steve
>
> Steve  Gilbert
> K1SG
> K1SG@AOL.com
>
>
> In a message dated 7/17/2014 12:03:12 P.M. Eastern Daylight Time,
> amps-request@contesting.com writes:
>
> -----Original Message-----
> From: Amps  [mailto:amps-bounces@contesting.com] On Behalf Of John Lyles
> Sent: Tuesday,  July 15, 2014 1:14 AM
> To: amps@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.
>
> 73
> John
> K5PRO
>
>
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