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 <ranchorobbo@gmail.com> 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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>
--
Later,
John Bodine/WU2E
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