Quote:
Originally Posted by Captainclock
Could of been as well it does have a 1/4" input jack on the front and a single RCA jack on the back for a speaker to be hooked up for an audible pitch tone to be put out so you can hear the note you're tuning (kind of like an electronic tuning fork or pitch pipe) although the reason why I think this might of been used for instruments like the piano or even band instruments is because it came to me with a Radio Shack/Realistic floor mic attached to the unit which would tell me that it was being used at one time to tune acoustical instruments and not just electronic instruments. I did noticed though that the 2 neon bulbs in the unit will eventually need to be replaced because they aren't glowing as bright as they should be, with very little neon glow left around the cathode of the neon bulbs.
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If the neon lamps are on the inside, they might be used as a voltage regulator or a simple tone generator.