[SECC] Amps

[iem@febc.org.ph (Guy West)]

Modern shortwave transmitters tend to use
4CX100,000 tubes for the final with a single
driver either 4CX5000 or 4CX3000 size. 

Earlier stages are solid state.  Am transmitters
as specified are now typicallly solid state. Using
plug in modules about the size of a stereo amplifier
composed of power fets and combining networks. Our
medium wave transmitter has one of these modules for
a driver and 10 more as the main amplifier for 75KW
operation.  Its great (Nautel design) because you can
service modules without going off the air, the power is
only reduced.

Guy - DU1/N0MMA
Far East Broadcasting Co. Philippines