[Amps] TL-922 voltage / bias

[Carl]

That idle current is fine for 1 tube and the voltage drop is excessive. 
Start by measuring the grid chokes for an open or looking for color on both 
plates.

Carl
KM1H


----- Original Message ----- 
From: "Tom Prohigh" <tomp at prohigh.com>
To: <amps at contesting.com>
Sent: Friday, February 12, 2010 9:47 AM
Subject: [Amps] TL-922 voltage / bias


>I have recently aquired a TL-922.  It is on a stiff 240V line which 
>actually
> measures 245V.  No load voltage on CW is 2200 and on SSB is 3100.  Under
> full load the CW drops to 1900V @ 600ma and the SSB drops to 2400V @ 
> 800ma.
> Is there really suppose to be this much drop?  It has the original 200uf
> caps in it and I was thinking about replacing them with 560uf units.  Also
> the grid bias on CW is 60ma and on SSB 120ma which seems a little low.
>
>
> thanks
>
> Tom - AB3FL
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