Fuse location ....( if any) in MGA Mitsubishi DA P600 Pre-amp

I just purchased this vintage pre-amp and cannot find the location of the fuse.
It works great. I always check fuses for correct values .
I removed the top and bottom of this unit and looked everywhere, but NO glass fuse.
Is there a fuse in this unit?
PLEASE HELP ...thank you.

A lot of these old units have the power switch on a circuit board connected by a plunger to a push button on the front panel. Follow the plunger to the circuit board. The fuse should be on the board right next to the switch.
@ rocky1313

As gs5556 said.

You will find it on the left hand side of the switch.


 service manual