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@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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