Accuphase A-70 service manual wanted

Why?
Describe the output device, rail volts, and your problem.

Most amps have similar circuits with minor variations.
Like the STKs, 2955 / 3055 , TIPs, chip amps and so on.
Unlikely it was a unique design.
So a similar circuit can be found in another model from a different maker, and that can get you started.
 
You mean it did not specify the input voltage in the instruction manual?
Incompetent clowns...and that tells a lot about the company's attitude for customers.

If it is outside the USA, probably a 240 V supply is being used.
Ask the seller.