The CV1104 transmitting beam tetrode was a pre-WWII HF design. 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: Private communication & ¹⁰⁰⁰⁵.

 
Pin Connections

B5	1	2	3	4	5	tc
	g2	g1	f	f	g3	a

 
Absolute Maximum Operating Conditions^¶

Beam Tetrode	Vh	Ah	Va	Vs	Vg	mAa	mAs	Pdriv	Pout	Pdiss	freq
	6.0	1.3	1000	300	-70	80	23	0.7W	60W	30W	20MHz