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Old 12th Jan 2010, 12:34 am   #61
Philips210
Nonode
 
Join Date: May 2007
Location: Redruth, Cornwall, UK.
Posts: 2,562
Default Re: Homebrew Valve Tester

An excellent project Mike, very professional.
I own an AVO VCM MK3 that is rather bulky compared to your design. When time permits, I'll have a go at building your circuit, it looks like a great project. I think that ferrite beads added to the valve base connections could be employed to minimise possible parasitic oscillations. This may be important as more bases are added.

Ed Dinning's suggestion of a separate transformer for the heater supply seems to be the best solution for a wide range of heater voltage requirements. Heavier duty switching may be required for the various heater ranges or separate wire jumpers could be employed.

Regards
Symon.

Last edited by Philips210; 12th Jan 2010 at 12:37 am. Reason: spelling error
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