hifi engine

JDI Amplification

I'm looking for any information about the JDI Monoblock
Amplifier that was marketed by Castle Acoustics back in
1989. There is virtually nothing out there on the net
except a small excerpt form Gramophone Magazine.
Any information appreciated, like specs (all I know is
they were rated at 60wpc) pictures or even a schematic.

I have 4 of these and they sound excellent but I know nothing
else about them