[Amps] GI-7b amp

[Jeff]

The tube is ok.  It needs voltage to really do a good job so for the B+ 
think above 2500.  Plus you need a pi input net to get decent efficiency out 
of the tube.  A swamped resistor drive results in poor efficiency.

73/jeff/ac0c
www.ac0c.com
alpha-charlie-zero-charlie

-----Original Message----- 
From: Steve Wright
Sent: Wednesday, November 08, 2017 1:09 PM
To: amps at contesting.com
Subject: Re: [Amps] GI-7b amp

On 08/11/17 09:03, Stan Gammons wrote:
> I was looking at "The Everyham's Amplifier" in the latest handbook and it 
> mentions using a pair of GI-7B tubes.  I have a pair of these I was going 
> to use for a Clipperton L conversion, but I changed my mind. I've seen 
> some comments saying the IMD performance of the GI-7B isn't very good.  Is 
> this correct or is the GI-7B a decent choice for a homebrew amp?

You've seen those comments because of a very small fringe group (here
and elsewhere) choose to push their own religion of cleanliness - so
much so that other hams hesitate.

Don't feed their narcissism.  Just build it.  You'll have fun making it
and using it.

S

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