11-10-2016, 01:53 PM
(11-10-2016, 01:41 PM)ppppenguin Wrote: A speculation. There are multiple valveholders of most types and no means of selecting the electrodes. Are there sufficiently few dfferent pinouts for valves of that period that it was just simpler to have a socket for each possible pinout?
That's what I think it is as it's a pre thumbwheel pin selector switch version, the thumbwheel switch pin selector job came later on enabling more different types of valve holders to be fitted.
The EMER manual covering the later two panel type is available at the link below, I suspect that the meter unit panel is the same as the OP's or at least very similar:
https://frank.pocnet.net/instruments/AVO...O-EMER.pdf
Lawrence.
