Quote:
Originally Posted by TonyDuell
From what I can discover, it's a special-purpose valve tester used to test the valve in a 'panel amplifying 32'. It's connected across the cathode resistor of the valve, you then 'set zero' to balance the normal valve current (similar to backing off in the AVO valve characteristic meters), then press the measure button which shunts the cathode resistor with a resistor in the tester and thus changes the operating point of the valve. Adjust the mA/V control to get back to zero on the meter, then read off the mutual conductance of the valve.
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I can firm its use from one of my copies the 'Vocabulary of Engineering Stores' -!956'ish edition -
TESTER RP1100 For testing Valves CV 1343 on Panels, Amplifying No 32. Dgm RP1100 Portable. (EI TRANSMISSION, Tele, F 1053)
One place I looked after, deep underground, had racks of Amps 32 all full of valves with paper labels giving the exact date they were fitted - 99% were c1937 when the place opened - I'm told they were expecting a Mr.A Hitler ?