Valve Gallery - Diodes (1) 

Valves: D42, DD4, 2D4A, 2D4B.

Shown above is a Marconi Osram D42 diode. 4v heater, B4 base and height of 83mm.  Just a single diode contained within envelope. Shown above is a Tungsram DD4.  Two diodes contained within metallised envelope.  B5 base.  Gold circular legend can just be seen at 4 and 5 cm mark.  4v heater, height of 100mm..  

Shown above is an Mullard 2D4A.  4v heater, B5 base.  Contains two diodes.  Height of 111mm Shown above is a Mullard 2D4B.  4v heater, B7 base.  Contains two diodes.  Height of 95mm.

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