CV1574 RF pentode
This valve is based on the SP41. However, this example does not have metallising and the glass is a slimmer shape.
It carries the marking VM which may indicate the manufacturer but VM does not appear in the manufacturers table.
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This valve measures 92x30mm overall and has a Mazda Octal base |
| Heater voltage | 4.0V |
| Nominal heater current | 950mA |
| Max anode voltage | 250V |
| Max screen voltage | 250V |
| Max anode dissipation | 4.5W |
| Max screen dissipation | 1.25W |
| Mutual conductance * | 8.5mA/V |
| Max operating frequency | 60MHz |
| Capacitances |
| Cag max | 0.033pF |
| Cae | 5.5pF |
| Cge | 12.0pF |
*: At Va=200, Vg1=-1.5, Vg2=200
| Pin |
Function |
| 1 | Heater |
| 2 | Cathode |
| 3 | Anode |
| 4 | Screen grid |
| 5 | Suppressor grid |
| 6 | Metallising (missing in this example) |
| 7 | No pin |
| 8 | Heater |
| TC | Control grid |
|
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