ECH81
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Triode Heptode
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HF Frequency Changer
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6.3 V, 0.3 A Heater
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Base B9A
Typical Operation
| Triode | Heptode | ||
| Va(b) | 250 | 250 | V |
| Vg2 | ... | 103 | V |
| Vg1 | ... | -2 | V |
| Ia | 4.5 | 3.25 | mA |
| Ig2 | ... | 6.7 | mA |
| Ra | 33 | ... | kΩ |
| Rg2+g4 | ... | 22 | kΩ |
| Rgt+g3 | ... | 47 | kΩ |
| Rk | ... | 140 | Ω |
| gc | ... | 0.775 | mA/V |