I have acquired a vintage Delmhorst RC-1B wood moisture meter and I cannot find any info on it, I can find info on newer models that use a 9V battery, but this meter uses a 1U4 amplifier tube. It uses 4 X 22.5 volt alkaline batteries in series for a probe voltage of 86 volts!
If anyone knows of a source for a schematic that would be great. It has a very simple point to point electrical layout, just curious if there is a schematic out there.
I will reverse engineer a schematic for it while cleaning it up and replacing any resistors that are out of spec.
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