----- Original Message -----
From: <Gudguyham@aol.com>
To: <km1h@jeremy.mv.com>; <ko4nrbs@yahoo.com>; <amps@contesting.com>
Sent: Wednesday, April 13, 2011 8:31 PM
Subject: Re: [Amps] GU-84B Conversion (Re-thought)
>
>
> In a message dated 4/13/2011 8:22:42 P.M. Eastern Daylight Time,
> km1h@jeremy.mv.com writes:
>
> If you can find PL-175A's they will equal a 3-500Z watt for watt..
>
>
> Carl, I know you have a few years on me, so when I came on the scene the
> 3-500's were so popular that the PL-175A tubes were history by then. Sure,
> I
> have tried 4-400's in place of 3-500's so I know that they work OK in GG
> with a little less gain. I have never tried a PL-175. As I recall
> didn't
> Hallicrafters make an amp with that tube? I looked up the 175 and it
> seems
> it is a tetrode. When you mentioned it before, did you mean "watt for
> watt" in GG or AB1?
>
The 4-400 is a tetrode, the PL-175A is a pentode, it has slightly higher
output in any configuration.
Johnson used both in the T-Bolt
Carl
KM1H
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