Tube/Valve testing for Mesa Prodigy..

[markstuk]

Hi

Westside have suggested it might be a problem "with the tubes" ..

What is the best way to see if the 12AX7's and KT88's are working correctly?

Or is it best to send them off somewhere to be checked? If so, any recommendations/anyone close to me? (Banbury)...

Thanks in advance


MArk

[obbm]

Ideally you need to find someone who has a tube tester who can check them individually. Unfortunately the only guy that I know of who might be able to help is in my part of the world. I doubt that it's the 12AX7s as they go on for years however I seem to remember that a number of problems with the output tubes surfaced not long after the Prodigy was launched. Have you tried reseating them all?

[markstuk]

[quote name='obbm' timestamp='1484058354' post='3212285']
Ideally you need to find someone who has a tube tester who can check them individually. Unfortunately the only guy that I know of who might be able to help is in my part of the world. I doubt that it's the 12AX7s as they go on for years however I seem to remember that a number of problems with the output tubes surfaced not long after the Prodigy was launched. Have you tried reseating them all?
[/quote]

Yup, better, but still seriously down on volume.. Or it may not have heated up enough to do whatever it was doing before..

However by switching the tubes over (it can run on half power, so I thought this would isolate a power tube problem) and attempting to use the easy biasing function (which did not appear to function as advertised) I think I may have completely screwed the pooch.. Anyone fancy a free slightly smelly Prodigy to work on? I've lost patience with it now...