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Further measurement tonight on the transducer in my 002A showed 55 Hz at near 0 micro amperes, 60 Hz is 90 micro amperes and 65 Hz is 180 micro amperes. Far more sensitive than my digital frequency meter at 18 micro amperes per Hz. The transducer is a bit slow. There is no way to retrofit to...

Yes, Pete, there are two types of meters corresponding two different transducers. Mine is Technology Research Corporation of Clearwater FL, FSC 60177, model 72-5019, part number 10125. My friend's 003a has the same unit but batteries were dead so no live test. But my ohmmeter worked as a...

Good to know, I've traced the circuit diagram and see the same. This is but half of the frequency indication system, the other half is the meter. My meter is corroded beyond what I can repair, the movement appears to be electrically intact (moving coil, permanent magnet) and since the...

I'm working on the answer. Basically, the transducer converts the frequency into a small current, between 4 and 20 mA. A tiny current but enough to swing the needle. So my best guess based on the ranges of 55 to 65 Hz (10 Hz) and 4 to 20 mA (16 mA) would put the 60 Hz current at 12 mA. You...