Hi Jay
Thanks for the info – much appreciated. It looks as though the Commander 2500
went through quite an evolution from its introduction to the later stages of
production. I think this one is a later vintage from yours.
Vy 73
Steve, VK6VZ
From: Jay Sturtevant
Sent: Friday, July 27, 2018 11:30 PM
To: Steve Ireland
Cc: amps@contesting.com ; Phil Hartwell
Subject: Re: [Amps] Equalising the air flow on Commander 2500 tubes/replacement
neoprene chimneys
Steve,
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.
Thanks!
Jay, K2ZT
On Fri, Jul 27, 2018, 10:13 AM Steve Ireland <vk6vz@arach.net.au> 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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