[Amps] input matching question on the YC156?

[Bill Turner]

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

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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?

--
Bill W6WRT