Tube🌿Timethis is a Nuvistor! it's a super-advanced vacuum tube that could have beaten the transistor.
recursive 🏳️🌈@tubetime The lovely HP 3400a RMS voltmeter (1964) uses one of these in the input amplifier!
@tubetime The lovely HP 3400a RMS voltmeter (1964) uses one of these in the input amplifier!