[Milsurplus] Redifon equipment

[Military1944 at aol.com]

Hi all, HNY of course. 
 
Anyone got the circuit of the Redifon PU220 as used by the Navy. Its the  
light blue on. It appears to differ from the Army unit in that the Army one I  
have (green) is simply a transformer, diode and cap arrangement, no regulation  
at all. 
 
This blue one however has a circuit board inside and numerous components to  
regulate it at the 26v or so. There is quite a bundle of wires going  round 
and while they are all ringed its still a job to figure out  what's going on. 
 
It giving a large ripple on top of the dc component so needs looking  at.
 
So, any info greatly received. 
 
cheers, Ben.