Yamaha TA-60 pre '68 service manual

[Phantombox]

Hi guys.
I'm new to this forum...
I'm looking for the service manual for a 1967 Yamaha TA-60 guitar amp. There are upgrades in the 1968 version of the service manual (Yamaha TA30-TA60-TA120 Guitar Amplifier, readily available online), but crucial differences in the schematics, and particular components.
Can anybody help me?

Thanks in advance