...Cardiff calling... Cardiff calling... Luckily I was turning the
rheostat on this old thing when I encountered your signal!
Though I never owned one a pal of mine did for many many years and
regrets loosing it now!
IIRC there was a slight issue with the speed change device, but again
IIRC this was always due to a new belt being required.
1) A quick search on ebay turned up many Thorens spares and belts are
more of a simple size issue anyway, so you should be ok there.
2) The tone arm fitted will be your guide there... many of these had
tone arm swaps, often for SME's. Details are lost in the mists of time
in my mind but the pairing of tonearm to cartridge is most important - a
little googling should put you on the right track (Pun intended!)
3) Of the Pro-Ject Debut III I know nothing so will lave that subject to
anyone who does.
What I will add is that if you do purchase the Thorens, do listen to it
as it comes since logic suggests that whoever owned it knew what they
were up to when they purchased it!
Also It may well be worth the purchase of a new stylus (Assuming
availability) rather than a new cart. Something else worth mentioning
(For those not familiar with cartridges) is that all cartridges had
their own "Sound" and so were always something of a personal choice as
much as a specification led decision.
The main drawback I remember with the deck was the "Lift off" cover
(Rather than hinged) which always required somewhere to put it while you
played disks!
Hope that helps
Mike