Sensibly equivalent¶ to:
The CV1104 transmitting beam tetrode was a pre-WWII HF design the PT15. This exhibit is a genuine M-OV built PT15 but of 1950s manufacture, whereas exhibit PT15 is of 1940s vintage. The most obvious differences are in the style of labelling.
The valve has a directly heated oxide cathode.
The box anode is clearly visible as is the glass pinch construction.
G3JLZ reports: in the transmitter type T1154, a pair of VT104's were used in parallel in the RF power amplifier stage. The PA was suppressor-grid modulated for AM and MCW.
The wide glass tube envelope is 48 mm in diameter and, excluding the B5 base pins, is 171 mm tall.
References: Datasheet, private communication & .
Absolute Maximum Operating Conditions¶
Updated February 25, 2017. shape:wide.glass.tube construction:pinch type:beam.tetrode age:1930.1940 base:b5 heater:6.0v pins:5 pin:1.g2 pin:2.g1 pin:3.f pin:4.f pin:5.g3 pin:tc.a