[Amps] input matching question on the YC156?

[Phil Clements]

On Thu, 16 Sep 2004 21:54:56 -0700, Leigh S. Jones wrote:
>
>>rule 1: never apply plate voltage to the tube nor apply drive power
>>until after the prescribed filament warm-up period has elapsed
>
> _________________________________________________________
>
> Is this true even when the tube is biased into cutoff?  I've owned
> four commercially-made amps and all of them apply HV as soon as the
> power switch is turned on, but all four have the tube biased into
> cutoff.  Are you saying that is a design error?

It depends upon the tube you are talking about.
Eimac publishes specific instructions for each tube it manufactures on 
how to properly fire it up, and shut it down.

(((73)))
Phil, K5PC