Another AVO valve tester question - UK Vintage Radio Repair and Restoration Discussion Forum

David Pannell · 17th Sep 2012, 12:11 pm

Does anybody know if and when AVO switched from the EA50 and/or EB91 valves in their Mk1 through Mk4 characteristic meters, to solid state diodes?

I know that the Mk2 had the EA50, and the CT160, the EB91; but I should like to fill in the gaps for interest.

Many thanks,

Dekatron · 17th Sep 2012, 6:53 pm

The AVO Mk III VCM uses the EB91/CV140 and the AVO Mk IV VCM only use silicon diodes in all circuits. The earliest information I have on the AVO Mk IV VCM is from 1960.

17th Sep 2012, 12:11 pm	#1
David Pannell Retired Dormant Member Join Date: Oct 2010 Location: Horsham, West Sussex, UK Posts: 77	Another AVO valve tester question Does anybody know if and when AVO switched from the EA50 and/or EB91 valves in their Mk1 through Mk4 characteristic meters, to solid state diodes? I know that the Mk2 had the EA50, and the CT160, the EB91; but I should like to fill in the gaps for interest. Many thanks,

17th Sep 2012, 6:53 pm	#2
Dekatron Octode Join Date: May 2009 Location: Linkoping, Sweden Posts: 1,465	Re: Another AVO valve tester question The AVO Mk III VCM uses the EB91/CV140 and the AVO Mk IV VCM only use silicon diodes in all circuits. The earliest information I have on the AVO Mk IV VCM is from 1960. __________________ Martin, Sweden