Valve Gallery - Frequency Converters (1)

Valves: 41-MPG, FC4, TX21, MX40.

Shown above is a Cossor 41-MPG frequency converter.  Utilising a B7 base this is a heptode with 4v heater approx 140mm height Shown above is a Mullard FC4 frequency converter.  This is an octode utilising a B7 base and 4v heater approx 146mm height

Shown above is a Tungsram TX21 frequency converter.  Utilising a B7 base this is a triode/hexode with 21v heater approx 152mm height Shown above is a Marconi MX40 frequency converter.  Less commonly utilising an unmetallised glass envelope of 150mm height.  Again using a B7 base and is an heptode

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