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Re: [Amps] 2K Classic X filament issues

To: Donald Fox <>, Amps Group <>
Subject: Re: [Amps] 2K Classic X filament issues
From: Gary K9GS <>
Date: Wed, 04 Aug 2021 09:06:53 -0400
List-post: <>
Max-Gain Systems sells Bristol wrenches.,Gary K9GS
-------- Original message --------From: Donald Fox via Amps 
<> Date: 8/4/21  8:48 AM  (GMT-05:00) To: Amps Group 
<> Subject: [Amps] 2K Classic X filament issues Good morning 
Pete, et al:Pete, when you say clips, I assume you mean the small, removeable U 
shaped clips that apply pressure to the socket fingers themselves? The sockets 
in my Henry, are the tried and true Johnson 275s. The main portion of the pins 
appear to be riveted in, so I don't think in can easily move them around. It's 
interesting to note that Henry directly grounded the 3-500 grids, unlike 
Heathkit, Kenwood, etc, who kept the grids slightly above RF ground with small 
chokes. As I look at the socket pins, they look clean and what I would call 
normal. I went ahead, and removed/inserted a tube in each socket 3/4 times, and 
then left them in, and fired it up. There appears to be progress, as the 
brightness of both now seems to be almost equal. The ZG tubes with their 
graphite structure are a bit harder to judge, unlike the original Eimac design 
where the top of the star shaped anode assembly is open.Along this journey, 
I've discovered that the front 3-500 seems to have about 60-70% of air flow 
that the rear one does. I'd sure like to figure that one out. Given the size 
(and noise) of the blower, it's kind of surprising that the tubes stay in their 
sockets, lol.Henry used those darned Bristol screws to secure the anode coolers 
to the original Eimac's, and I can't seem to locate one to get them swapped 
over. I'd love to get them out of there, and go back in with a normal machine 
screw for ease of 
service.Don_______________________________________________Amps mailing 
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