AVOmeter Model 8 MkIV
Before you start, please read this disclaimer
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I have several Model 8 AVOs which I still prefer to use rather than digital multi-meters. I have redrawn the MkIV cicuit as the on line copies are usually very poor.
There is some quite interesting historical information at Richard's Radios website. Little else to say at the moment.
Peter Lawson, 6th February 2016.