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Old 20th Feb 2010, 7:32 pm   #176
swordholder
Rest in Peace
 
Join Date: Aug 2009
Location: East Preston, Sussex
Posts: 162
Default Re: The "Sussex" Homebrew Valve Tester.

John
If the voltage can be varied with with no load, it looks as though there may be current limiting taking place. How much current is being drawn? Check around TR3 and associated components. I assume the gate voltage was OK and also the voltage on the pot slider.
On mine, I tested an EL34, with the voltage set at 250, the actual voltage with a 75mA load was 247, negligible difference.
Other than that I have no other ideas to offer, may be some else has
Regards
Mike
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