I think the HF-V60 is the same as the HF-6V6P and the HF-V6K is the same as the HF-6VK. One lot for the Japanese market and the other for the rest of the planet. Attached some circuit diagrams and some photos. Cheers AM
Cannot discover any serial numbers on the photo's. Interesting tidbit is that there is also a HF-L60 which is using the 6L6 and is about 20 Watts. I came across these photo's and schematics after a lot of searching - I am building a clone of the Audio Note Kit 4 (about which I have posted recently) and Audio Note have almost the same setup for the driver and finals (except for the input tube) and Audio Note's unusual resistor choices had me scratching my head. ( For the schematics of the Audio note P2-PP and Audio Note kit 4 see my previous posting - I bought two PCB's on ePray but had to do some surgery on those PCB's: removed the DC filament supply to the input tube and brought the grid stopping resistors close to the tube sockets of the 6V6 by cutting the tracks there and using SMD's resisitors instead.)
Am attaching the HF-L60 pictures - Sansui in those days were very highly regarded before they eventually went downhill and never were able to recover.
The chap of the HF-L60 came across two and restored those and you notice the before and after.
Hashimoto was Sansui's transformer supplier and still makes the transformers today (and I am using those in my build - the 6L6 version only needs some different OPT's (5K versus 8K PP and cathode resistors of the finals, rest can stay the same. But lots more heat and I cannot see that working too well inside a cabinet like Audio Note used).