ML4 / 10E/17 / VT90 / CV1732 / CV2815 triode
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The valve on the left measures 112x45mm overall and has a B5 base. The CV1732 (right) measures 110x32mm. |  |
Note the CV2815 is not specifically listed as ML4 but the example here carries both numbers. The EVS data for CV1732 shows the ML4 was its prototype and that PO VT90 is its equivalent. All are thus represented here.
| Heater voltage | 4V |
| Nominal heater current | 1A |
| Max anode voltage | 250V |
| Max anode dissipation | 5W |
| Mutual conductance * | 3.75mA/V |
| Amplification factor * | 12 |
| Capacitances | |
| Cag nom | 6.3pF |
| Cae nom | 4.5pF |
| Cge nom | 7.2pF |
*: At Va=200, Vg=-8
| Pin | Function |
| 1 | Anode |
| 2 | Grid |
| 3 | Heater |
| 4 | Heater |
| 5 | Cathode |
Below left CV1732, right PO VT90.
