[Amps] Bias Whoes

[K7RDX]

Plate voltage has large influence on idle current...gi7b with 2kv/pl works
good with 48v/50watt zener diode,assuming proper grounded grid
design...Nearly every Russian tube (Triode) Iv`e played with shows somewhat
diffrent idle current with the same value of bias...Could it be quality
control? Jim.
----- Original Message -----
From: <Gudguyham at aol.com>
To: <hahn at emeraldis.com>; <amps at contesting.com>
Sent: Tuesday, February 24, 2004 4:58 AM
Subject: Re: [Amps] Bias Whoes


> In a message dated 2/24/04 12:33:24 AM Eastern Standard Time,
> hahn at emeraldis.com writes:
>
>
> > I can't get tubes to have idle current
> > of 100ma. every time I key its "MAX" current on the plate, even without
> > any audio input to transceiver. Maybe I am doing something wrong on the
> > input? Chuck AI4BB
> >
> >
>
> DO YOU HAVE ANY PARASITIC SUPPRESSORS?  SOUNDS LIKE THE AMP IS
OSCILLATING.
> COULD BE SOMETHING WITH THE INPUT TOO.
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