| Manufacturer | Part Number | Description |
|---|---|---|
Philips Semiconductors (now NXP Semiconductors) |
ECH81 | Triode - Heptode 1954 |
| Marconi | ECH81 | Triode - Heptode |
| LA RADIOTECHNIQUE | ECH81 | Triode - Heptode |
|
Philips Semiconductors (now NXP Semiconductors) |
ECH81 | Triode - Heptode 1969 |
Mazda |
ECH81 | Oscillator |
RFT |
ECH81 | Triode |
