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Re: [Amps] Equalising the air flow on Commander 2500 tubes/replacement n

To: Steve Ireland <>
Subject: Re: [Amps] Equalising the air flow on Commander 2500 tubes/replacement neoprene chimneys
From: Jay Sturtevant <>
Date: Fri, 27 Jul 2018 11:30:04 -0400
List-post: <>

I have a Commander HF 2500, 1996 vintage, however, there are no chimneys on
top of the 3cx800s and I do not have a "solid screen".

 The amplifier you're describing may be a later vintage.

I don't want to waste your time-- curious.


Jay, K2ZT

On Fri, Jul 27, 2018, 10:13 AM Steve Ireland <> wrote:

> G’day everyone
> A good friend of mine has recently acquired a Commander 2500 which is need
> of repair/rebuild after a long and hard life.
> On taking the amp apart, he noticed one of the neoprene chimneys on the
> (two) 3CX800 tubes was more melted than the other.  He then put the amp’s
> fan on and discovered the tube with the more melted chimney was receiving
> considerably less air flow than the other, owing to a screen placed between
> the two tubes.
> A potential solution was to replace the solid screen with a mesh one, but
> I said it was likely that someone on this reflector had already come up
> with a solution/modification to solve this problem and I’d ask for him.
> It also occurred to me that someone may know where some suitable neoprene
> can be purchased, so he can make replacement chimneys for the two tubes.
> Any ideas on this would also be approached.
> Vy 73
> Steve, VK6VZ
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