I've had this WW2 transceiver
for many years but I've never looked insde the case until today.
I imagined it used 2 volt valves and had a very low output power
but, to my surprise, it uses standard octal valves with 6.3volt
heaters. Inside the outer case is the valve layout and you can
see what types are used. The types are even referred to by their
commercial numbers so are instantly meaningful to amateur radio
enthusiasts of the valve era. The 6U7G is a variable mu pentode,
not too different from the KTW63, 6K7 and EF39. The 6K8 and 6Q7
are very familiar as is the 6V6, of which one is used as the
PA stage in the transmitter and the other as a Heising modulator. |