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Re: [Amps] Need reliable source for ACOM2000A tubes GU74B?

To: <>, <>
Subject: Re: [Amps] Need reliable source for ACOM2000A tubes GU74B?
From: gudguyham--- via Amps <>
Reply-to: "" <>
Date: Thu, 24 Nov 2022 17:59:52 +0000 (UTC)
List-post: <>
There has been some jibberish that the Chinese “might” be making a new version 
of the Russian GU74B.  I have not seen one yet and I’ll believe it when I see 
it.  Until then AFAIK all GU74B tubes are all NOS Russian Cold War surplus.  
The last batch made probably in the mid 90’s.  Unless these “alleged “ new 
GU74B tubes are real, any GU74B you buy from regardless who you buy it from, 
are all NOS if in fact they never been used.  Therefore, if you can find ANY 
factory sealed GU74B it’s no better than any tube you can buy at any ridiculous 
price!  A GU74B for $999.00 is the same as you’ll buy for a sealed NOS unit for 
about $200.00.  Some off shore sellers will sell you these for about $125 each 
in a moderate bulk lot.  How many can you afford to replace for that price?  
4cx800 is an Eimac number and Eimac never made one.  Hams started calling GU74b 
tubes 4cx800 because if Elmac made them that’s what they would probably call it 
based on specifications.

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On Thursday, November 24, 2022, 12:06 PM, <> wrote:

If you have a perfect antenna/coax system with no mini arcing occurring, the
Acom 2000A is a fantastic amp.  WOW, $2,000 for new tetrodes!

John KK9A

John Bodine wrote:

GU-74B is the correct tube and here's a link that I have used with no

I have bought off of ebay with real horror show results. DX engineering
used to guarantee their tubes for a year which is a very good thing but
check to make sure.

On Wed, Nov 23, 2022 at 1:38 PM <kq2m at> wrote:

> I need to replace one set of tubes for my ACOM2000A.
> Can anyone confirm that GU74B is the correct tube?  If not, what is the
> correct tube?
> Does anyone know of a reliable source for the ACOM200A good quality
> tubes?  Approximate cost?
> Tnx & 73
> Bob, KQ2M

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