50

This HF pentode valve has an 8-pin base, measures 102mm (from the 'handle' to the pins) by 44mm (across the metal plate at the top), and has a 'key' made in the glass as can be seen on the photo. The black 'handle' on top unscrews, but the metal cap is securely fixed. It is intended to be used as an RF oscillator and power amplifier.

12.6V/0.6-0.85A heater, 55W max power (40W normal).