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CV1104

Sensibly equivalent to:
PT15 SW40Pen VT104
See also:
Sir Christopher Cockerell
    
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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 & .

 

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
Thanks to Frank Philipse for supplying the above PDF datasheet.
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
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