I bought this strange device at a swap meet for 5 bucks
It appears never used .
You place the tip against a machine and listen for noises :U A transistor amplifier and a 9 volt battery are inside the tube .
The instruction sheet has some funny English grammar , made in Japan it says . At a guess , early 1960's era. A pic shows a guy listening to a bench grinder with the device . :rolleyes:
Attached Images
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It appears never used .
You place the tip against a machine and listen for noises :U A transistor amplifier and a 9 volt battery are inside the tube .
The instruction sheet has some funny English grammar , made in Japan it says . At a guess , early 1960's era. A pic shows a guy listening to a bench grinder with the device . :rolleyes:
Attached Images
tester.jpg (93.4 KB)
Read the full thread at metalworkforums.com...
Machine tester
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