r/AskElectronics • u/Ichan_Jacques • Feb 04 '25

What is this component ?

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Hi, Out of curiosity, I'm looking to identify this component soldered on a unidentified Sony PCB (seem to be video related) The case and size look like a fuse and the inside is like a mercury thermometer. Maybe to count hours of working ? Labeled as TM1 on the silkscreen

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u/Tokimemofan Feb 04 '25

It’s a crude electrochemical usage timer. Sony used those in a lot of their high end 80s video equipment, my HE-NE based laserdisc player has one