[Amps] Need reliable source for ACOM2000A tubes GU74B?

[Boye Christensen]

Hi

I don't know ACOM2000 Amp how it is built e.t.c.

To take one tube out an test no 2 will be ok  with lower input PWR and 
Output PWR !

To disconnect Anode Voltage will be a fatal error, without any circuit 
protection

g2 will act as anode and posibly burn g2 then the tube is finish for all.

Most Amplifiert with tetrode has a safty circuit that discionnect g2 
voltage if anode Voltage

is near g2 voltage.


73 Boye


On 26-11-2022 11:37, 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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