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| Part Number | ECH4 |
| Description | Triode - Heptode |
| Info | . |
| Manufacture | ETC |
| for PC | Download ECH4 Datasheet |
| Part Number | ECH4 |
| Description | Triode - Heptode |
| Info | page 1 2 3 ECH4 sheet 1 2 FP date 1948.09.24 194. |
| Manufacture | Philips |
| for PC | Download ECH4 Datasheet |
| Part Number | ECH41 |
| Description | Triode - Hexode / Frequency Changer |
| Info | . |
| Manufacture | ETC |
| for PC | Download ECH41 Datasheet |
| Part Number | ECH41 |
| Description | Triode - Hexode |
| Info | page 1 2 3 ECH41 sheet 1 2 FP date 1953.07.07 19. |
| Manufacture | Philips |
| for PC | Download ECH41 Datasheet |
| Part Number | ECH42 |
| Description | Triode - Hexode |
| Info | . |
| Manufacture | LA RADIOTECHNIQUE |
| for PC | Download ECH42 Datasheet |
| Part Number | ECH42 |
| Description | Triode - Hexode / Frequency Changer |
| Info | . |
| Manufacture | ETC |
| for PC | Download ECH42 Datasheet |
| Part Number | ECH42 |
| Description | Triode Hexode / Frequency Changer |
| Info | . |
| Manufacture | ETC |
| for PC | Download ECH42 Datasheet |
| Part Number | ECH42 |
| Description | Triode - Hexode |
| Info | page 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 EC. |
| Manufacture | Philips |
| for PC | Download ECH42 Datasheet |
| Part Number | ECH42 |
| Description | Triode Hexode |
| Info | . |
| Manufacture | MAZDA BELVU |
| for PC | Download ECH42 Datasheet |