Hello Dave!
The inner structure is 100% the same. The GS35b cooler is from copper,
mounting in a cone. The GS31 has diecast cooler, mounted on the flat top
surface. You can use a GS31 cooler on a GS35, but not vice-versa! If you
need a more flat tube, cut a GS35 down. The cooling behaviour is much better
with heavy copper head!
Tom, DJ5RE
www.hoeppe.name
----- Original Message -----
From: "David H Craig" <davidhcraig@verizon.net>
To: <amps@contesting.com>
Sent: Saturday, December 05, 2009 5:18 AM
Subject: [Amps] GS-31B
> Has anyone checked out / built a GS-31B amp? Based on the spec sheet
> and tube dimensions, they appear to be a GS-35B with an inferior anode.
> Not having handled a 31B I can't tell for sure, but I am betting the anode
> coolers are interchangeable. Anyone have any input on this?
>
> 73 Dave N3DB
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