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George G4EUF · 14th Mar 2017, 4:43 pm

I have recently noticed that there are now two diodes across R12 in the circuit diagram, was this to give some extra protection to the GM meter?
With my tester I appear to get rather high GM readings, any suggestions?
George.

14th Mar 2017, 4:43 pm	#1404
George G4EUF Tetrode Join Date: Oct 2010 Location: Loughborough, Leicestershire, UK. Posts: 84	Re: The "Sussex" Homebrew Valve Tester. I have recently noticed that there are now two diodes across R12 in the circuit diagram, was this to give some extra protection to the GM meter? With my tester I appear to get rather high GM readings, any suggestions? George.