Below is a Picture of my Quad 303A (AM8/14) and AM1/53 Frequency splitting amps (bolted to the sides). These are used with LS3/7 loudspeakers.
Here is a data sheet on the system. They were designed for the BBC. I have had to repair the main amps by replacing capacitors.
I also had a faulty UA739 IC in one of the AM1 units, the socketed replacement can be seen below.
I also have a spare AM1 module ( the box on the side of the quads)
Inside the AM1 frequency splitting amplifier
Below are my 2 cd104 cd players CIRA 1984. The top model is the earlier version and the bottom the later. These are great players.
Both have been serviced, RCA cables changed and new OPA op-amps fitted.
Nagra T reel to reel tape recorder and below, Tascam 133 casette recorder. The 133 needed a new belt fitted.