Re: AVO Multimeter survey
I don't know much at all about the basic DC Avominors, they never really sparked my interest! - although i can isolate roughly where the start of the production run was, as i have meter No. 1034-93 from September 1933.
Interesting about the serial number anomaly that Andy mentions.
The facia of the Type HR DC Avominor lacks the upstand/ring around the wander plug sockets- which makes it possible to affect the reading if the end of the operator's finger touches certain unoccupied sockets. I have observed this phenomenon but not investigated whether it's possible to get any sort of electric shock by doing this..others will know.
Dave
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