[TenTec] bringing up an old amp

[Chuck & Vicki Tifft]

If your Amp doesn't have a HV on/off switch.(most standby switches only 
disable the keying line) then leave the Anode lead(s) disconnected when you 
reinstall the tube(s).You can most likely run the amp with the cover off 
during this time. I don't put one completely back together until everything 
is fully tested. In broadcastig we had spare tubes on the shelf for years 
sometimes, and we rarely had the time to cook them for more 30 or 45 minutes 
or so before putting them on the air. It was very rare indeed to have a 
problem with that. Some of the tubes cost $60K a piece, so you didn't abuse 
them if possible. Certanly a few hours of filament time is OK, but over 
cooking the tube filament without HV can also be a bad thing.
W6RD
----- Original Message ----- 
From: "Stuart Rohre" <rohre at arlut.utexas.edu>
To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com>; 
<geraldj at storm.weather.net>
Sent: Friday, October 12, 2007 9:39 PM
Subject: Re: [TenTec] bringing up an old amp


> Gary,
> Most amplifiers have a "power" switch that brings up the filaments, and a
> separate "standby-operate" switch that brings up the B plus to the plates 
> of
> the finals.  You leave the plate voltage switch in "Standby" position, 
> with
> filaments on only.
>
> -Stuart
> K5KVH
>
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