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Valve Gallery -
Frequency Converters (2)
Valves: AC/TP,
AC/TH1, EK2, 2A7.
 
| Shown above is a Mazda AC/TP frequency
converter. This valve uses the much less common B9 base, and was in
particularly short supply during WW II. It is a triode/pentode with 4v
heater approx 125mm height. |
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Shown above is a Mazda AC/TH1 frequency
converter utilising a B7 base. It is a triode/heptode with 4v
heater, approx 123mm height. |
 
| Shown above is a Mullard EK2 frequency
converter, with P type base, also known as CT8 base. It is an octode
with 6.3v heater. Approx 92mm high. It must be the lack of
pins that makes focusing of side-contact valves tricky! |
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Shown above is a Am-Brit 2A7 frequency
converter. This uses a UX7 base which was commonly used in the USA
during the 1930s. Using a 2.5v heater it is a heptode of about 128mm
height. |
Continue to next
Frequency Converter gallery page
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