You can remove one tube, greatly reduce drive, and see if there is any output.
Make sure the anode cap from the removed tube is clear of everything near it
and not shorted. Replace all safety screening.
You can test both tubes, one at a time.
73,
Mike
W2AJI
Sent from my iPhone
> On Mar 9, 2018, at 12:48 PM, Stan Gammons <s_gammons@charter.net> wrote:
>
> Sounds like one of tubes shorted. If they are still under warranty, I'd
> contact RF Parts and see what they say. They replaced a tube I had that
> shorted.
>
>
> 73
>
> Stan
> KM4HQE
>
>
>> On March 9, 2018 11:11:45 AM CST, Bob <w3hkk@roadrunner.com> wrote:
>> Bought this used from an estate sale in 2014. Worked great for 3
>> yrs. Then a tube short blew a fuse. Replaced both finals and all was
>> well until a few months ago. The amp worked well for a few
>> transmissions, then the output went to zero. After a few cycles of
>> this I noticed the grid current which rested at zero began to migrate
>> negative. As it got worse, the output dropped to nil.
>>
>> One suggestion was that one of my new tubes ( from RF parts) is
>> failing. Another was a possible problem in the AGC circuit.
>>
>> Other suggestions? Also, I may need a repair tech and don’t want to
>> ship the amp, so someone in Ohio or driving distance from central OH
>> would be a plus.
>>
>> Thanks.
>>
>> Sent from Mail for Windows 10
>>
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