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

To: Amps Amps <>
Subject: Re: [Amps] Need reliable source for ACOM2000A tubes GU74B?
From: John Bodine <>
Date: Sat, 26 Nov 2022 07:21:04 -0500
List-post: <>
In the Alpha 91b, when a tube went bad it took parts with it. So trying the
tubes to see which is bad was not a attractive option after fixing the
power supply.

On Sat, Nov 26, 2022 at 5:38 AM Rob Atkinson <> wrote:

> >Doesn't look like Array Solutions has any GU-74Bs at the moment but they
> >will test them for you for $35 each. Pretty good deal since they usually
> go
> >up one at a time and you are left wondering which one is still good.
> Is there some reason why you can't disconnect the anode or remove one
> tube and test the other one in your amp then switch to the other
> socket to test the second tube?  Basically run a two tube amp with one
> tube at a time.  It seems to me the dud will be revealed that way.  Or
> both will be good or duds.  Save $70 plus shipping.
> Rob
> K5UJ
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        John Bodine/WU2E
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