Wanted schematic or photo overeem pamsonic 80

A friend of mine gave me an Australian “built in brisbane Queensland” amplifier.
Brand: overeem
Model pamsonic 80

The unit has failed as the preamp transistors had rusted the legs off and got lost.
I can’t identify the 5 of the 6 transistors on the pcb.
I think the first three are bc109.

Would someone have a schematic or even closeup photos of the pcb.
 
Hans Overeem designed more than one brand of instruments, amps and speakers and sold them through other businesses with various brand names. I would not be surprised to find the same or similar 1960s-70s design amps with much the same preamp design, branded "Overeem", "Transonic" or maybe "Vase", to name a few. Try searching the above keywords with "guitar amplifier" instead.
Hans Overeem amplifiers Sydney – Jedistar