[Amps] GU-84B Conversion (Re-thought)

[Carl]

----- Original Message ----- 
From: <Gudguyham at aol.com>
To: <km1h at jeremy.mv.com>; <ko4nrbs at yahoo.com>; <amps at 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 at 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