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| Part Number | ECH21 |
| Description | Heptode |
| Info | . |
| Manufacture | TESLA |
| for PC | Download ECH21 Datasheet |
| Part Number | ECH21 |
| Description | Triode - Heptode |
| Info | page 1 2 3 4 5 ECH21 sheet 1 2 3 4 FP date 1953.. |
| Manufacture | Philips |
| for PC | Download ECH21 Datasheet |
| Part Number | ECH21 |
| Description | Triode - Heptode |
| Info | . |
| Manufacture | ETC |
| for PC | Download ECH21 Datasheet |