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Feb26-12, 01:22 AM
HW Helper
P: 5,465
Quote Quote by dlgoff View Post
I remember my parents having a battery operated "portable" tube radio. If I remember correctly, it used a 96 volt battery. I was very young and don't remember hearing a vibrator.
It probably used two batteries, the high voltage one and a low voltage low impedance battery for the filaments. Maybe it clipped to a car battery for a longer life?

The vibrator allowed a car battery to operate a valve radio, by chopping the DC and feeding it through a transformer. Vibrators are wasteful.