EF54 / CV1136 / VR136 / 5A-156M signal amplifier pentode
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The valve measures 75x35mm overall and has a B9G base |
The CV1136, or RL7, was a variant of the EF50. It had duplicate cathode leads and aligned grids to improve on the earlier design, to the extent that it was superior to acorn pentodes up to 300MHz.
| Heater voltage | 6.3V |
| Heater current | 300mA |
| Max anode voltage | 300V |
| Max screen voltage | 300V |
| Max anode dissipation | 3.0W |
| Max screen dissipation | 1.7W |
| Mutual conductance | 7.7mA/V |
| Anode impedance | 500k ohms |
| Inner amplification factor | 80.0 |
| Max operating frequency | 300MHz |
| Capacitances | |
| Cag max | 0.02pF |
| Cae max | 5.3pF |
| Cge max | 8.8pF |
| Cg1 g2 nom | 2.1pF |
| Pin | Function |
| 1 | Heater |
| 2 | Anode |
| 3 | Screen grid |
| 4 | Internal screen |
| 5 | Internal screen |
| 6 | Control grid |
| 7 | Internal screen |
| 8 | Internal screen |
| 9 | Heater |
See also CV380.
VR136 version. Also an STC 5A/156M which shows Mullard EF54 on the rear.