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I've got NOS germaniun on hand and will give it a try
Tyhese are both 5s. The battery for one is VS-328 and the other is VS-163 4.5v. The Sam's says 9volt! It has to be wrong. If I power it w/ 9v the transducer will arc!
Im suspecting there was (back in the day) a handy service replacement available if these went belly up or the slide contacts broke or corroded.
Sounds like good insight, THANKS Maybe well get more.
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