Hello.

The 2 bogen amps are tubeless, as in no tubes in the sockets.
The other pair are transistor and the transistors in the output section are missing.
I looked at the schematic, plopped in a pair of 2n3055 and set bias, good.
I am going to put in a pair of 2n3771s in the other one, and replace all the caps in both.
The pair of tube amplifiers may not be worth the effort.
Got the Partner Plus programmed and working to 100%, not bad for an analog system.
The SCA units? SCA is obsolete around here so it is just an FM tuner under crystal control.
There is all sorts of 1a2 equipment here, everything but the sets themselves.