Unless the TTS-8000 just needs light cosmetic work it's just not worth the effort of a full restoration. They were an early effort by Sony to try and capture the low-end of the professional market. Most were sold to consumers.
I have restored 3-4 of these for customers over the years and IMO they're just not that great. Looks - good. Build quality - OK. Ease of finding replacement parts - poor. Sound quality, once restored - OK but not great.
Unless you are in love with this model I would look for something else as a restoration project: TD-124, 301/401, Lenco, Rek-O-Kut or EMT. All of these will provide a better final result and reward for your efforts.
I have restored 3-4 of these for customers over the years and IMO they're just not that great. Looks - good. Build quality - OK. Ease of finding replacement parts - poor. Sound quality, once restored - OK but not great.
Unless you are in love with this model I would look for something else as a restoration project: TD-124, 301/401, Lenco, Rek-O-Kut or EMT. All of these will provide a better final result and reward for your efforts.