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MOV R type triode

Size
This valve measures 115x53mm overall and has a 4 pin base

Unfortunately this valve has a broken filament and base pn. The colouring on the glass is typically from the use of a phosphorous getter. It is a Marconi Osram Valve 'R' type, labelled BBC and R9089.

Filament voltage4V
Filament current650mA
Mutual conductance0.225 at Va=100V
Amplification factor9
Anode impedance40k ohms

inside view
R type

This file was last modified23:20:41, Friday November 02, 2012