EA50 | A miniature VHF diode. |
EA52 | A miniature UHF diode |
EB5n | None known in the UK |
EC50 | Not known in the UK |
EC51 | Not known in the UK |
EC52 | A VHF oscillator triode on a B9G base. |
EC53 | A miniature VHF triode, similar to the EA50 but with two top pins for anode and grid. |
EC54 | A VHF triode on a B9G base, designed for grounded gird operation. |
EC55 | Equivalent to the M-OV DET22. The successor was the TD03-5. |
EC56 | A microwave 'lighthouse' style triode with threaded grid ring. This may not have gone into general production as EC56. |
EC156 | An industrial development of the EC56. |
EC157 | A higher power development of the EC56. This valve was produced in reasonable quantities. It was rated to 4GHz. It has been known to deliver over 2 Watts as an amplifier at 2.5GHz. It is claimed that under the correct conditions it could oscillate up to X-band. |
EC158 | Not known in the UK |
EC159 | An external anode version of the EC157. This valve was rated at 50 Watts anode dissipation when coupled to a suitable heat sink. It is probable that this was only made in small quantities. |
EE50 | A secondary emission amplifier on a B9G base. |
EF5 | An amplifier pentode on a Ct8 base. The Exn series contains many Ct8 valves. |
EF50 | The most famous valve in this series. |
EF51 | Not known in the UK |
EF52 | An amplifier pentode on a B8B base |
EF53 | Not known in the UK |
EF54 | A development of the EF50 with separate cathode leads arranged to return the grid and anode circuits separately. This reduced degeneration due to a common cathode inductance |
EFF51 | A double pentode on a B9G base |
EH50 | At various time after WWII, rumours of a mixer for VHF television surfaced, in practice the EF50 was quite satisfactory |
EL50 | An output pentode on a Ct8 base |
EL506 | An all glass output pentode on a B9D base |
EY50 | miniature wire ended EHT rectifier for VHF TV |
EY51 | A miniature wire ended EHT rectifier for VHF TV |
