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Mullard Miscellaneous Base Valve Series

    
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Mullard, Philips, and possibility Telefunken, shared a common index of valve designations. The base designation was used for a variety of special glass seals. Here are some of them from the domestic ranges. In many cases the valves also had CV designations.

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

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