CV1052 / VT52 / EL32 / 10E/11398 Pentode
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The valve measures 108x28mm overall and has an octal base. G1 is the top cap. |
This valve is equivalent to the EL32 audio output pentode.
The valve shown on the right has the marking GPO Batch Sampled 8288 marked on the base and M02 8612 on the glass. See below for other examples. See also CV5233.
| Heater voltage | 6.3V |
| Heater current | 200mA |
| Max anode voltage | 300V |
| Max screen voltage | 250V |
| Max anode dissipation | 7.5W |
| Mutual conductance * | 2.85mA/V |
| Anode impedance * | 70k ohms |
| Max operating frequency | 20MHz |
| Capacitances | |
| Cae | 7.6pF |
| Cge | 4.4pF |
| Cag | 0.5pF |
*: At Va=Vg2=250, Vg1=-18.5, Ia=30mA
| Pin | Function |
| 1 | n/c |
| 2 | Heater |
| 3 | Anode |
| 4 | Screen grid |
| 5 | n/c |
| 6 | no pin |
| 7 | Heater |
| 8 | Cathode + suppressor grid |
| TC | Control grid |
More examples. These measure 108x35mm. The top two are VT52's, the bottom left is simply marked CV1052 and the bottom right is marked both CV1052 and EL32 - this one carries the marking GPO Batch Sampled 4388 on the base.
