Maine 100S schematic - or similar

[mikeydee77]

Hi I have picked up an old Maine 100S head that has very distorted output. Could do with a schematic of this or any other model might help as it looks like it is based on modular boards.

It is a 100W head transistor, no op-amps, from the UK the filter caps mention the year 1974 and the cabling is all very neatly done with lacing cord.

Thanks for reading

Mike