The idle current does NOT change between standby and operate. It is over 100
(just under the "second line" on the meter or almost 2/3rds of .2 amps.)
----- Original Message -----
From: Mike Schatzberg
Date: Thursday, May 26, 2016 8:00 pm
Subject: Re: [TenTec] Centurion Amp - early model, looking for advice
> Firstly, does the idling current change from standby to operate?
> If it does not change, and remains the same, you may have no
> bias at all. The triodes are zero bias tubes and will operate
> with no bias.
> That would explain why the tubes are running so hot.
> If the idling current is around 60 to 75 mils, there is bias
> voltage applied. If over 100 mils, there may be no bias at all.
> ( pair of 3-500 triodes)
> The higher the idling current, the easier it is to drive the
> Sent from my iPhone
TenTec mailing list