|
CV57 beam tetrode 'hard valve'
modulator.
 |
The valve measures 190x50mm
and weighs around 150g. It has a 4-pin base. The anode is connected
to the top cap. |
The CV57 was used in pairs
in parallel to modulate a CV64 magnetron in the
AI Mk VIII in late 1941. By mid 1942 it had been replaced by the CV85
trigatron.
| Heater
voltage |
12.6V |
| Heater
current |
1.75A |
| Max.
anode voltage |
11kV |
| Max
screen voltage |
1.4kV |
| Max
anode dissipation |
15W |
| Max
screen dissipation |
2.5W |
| Max
grid bias for cutoff |
-800V |
| Max
peak anode current |
5A |
| Max
peak screen current |
0.6W |
Connections: 1 G1, 2 Heater, 3 G2, 4 Heater/Cathode, Top Cap Anode.
 |
The CV57 had two box-section
cathodes, similar to those of the KT66 but
slightly larger. |
| The valve has the usual
pinch and wire supports, but the screen grid connection is taken through
the side rather than the pinch itself. |
 |
|
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