[Milsurplus] Redifon HF HP Amp GA481 ??

[Military1944 at aol.com]

Re the HP Amp, the Redifon GA481

Does anyone know how it differs from the GA480 ? It seems to have a HP/LP switch otherwise very similar. Is there any difference in the circuit of it ? 

The matching psu, PU220, seems to differ quite a lot from the one that comes with the 480, the 480 is a tranny, rectifiers and big caps, this 220 has a complicated circuit board inside and loads more bits. Anyone have a circuit diagram ?

cheers, Ben G4BXD