Not that many.
1. Akai - model unknown. Plasticky and cheap. Mid 80's.
2. Rega Planar 2/Bias. First real turntable I bought. Gave me great joy through the late 80's.
3 & 4. Pro-ject 6.1 & Rega Planar 3/Elys. Early to mid 90's. First turntable with suspension (the Pro-ject). The beginning of an end. Had trouble with both players - probably due to lack of proper placement/isolation of the decks. The lure of the first CDP... (which was eventually to be a Teac CD-Z500).
Sold the record collection - luckily no more than 100 LP's strong. Then took a 10 years hiatus from the vinyl game until 2005.
5. Thorens TD150Mk2. First with the "kugelarm" and later with SME 3009 Improved. Lovely little deck. A bit fiddly but this was also the charm.
6. Lenco L75. In big heavy CLD plinth (ply and MDF). Thanks to the long Home Depot thread on A'gon. With SME 3009, RB250 and then Audio Technica AT-1005 II (beautiful vintage arm). Huge sound with immense dynamics - not bettered since. But was too unrelenting verging on fatiguing. Could probably have been remedied with experimentation but was not to be.
7. Garrard 401. Birchply plinth and Michell TecnoArm. Best looking Turntable I've owned. Fun muscular sound with a bit of emphasis on the lower end (not quite as neutral and extended as the Lenco). Should probably have stuck with it and tried with a better plinth.
8. Rega P7. Had this longer than any of the previous. Nicely balanced and did nothing wrong but perhaps not the most exciting of record players when push comes to shove? That strobe platter though..
9. Technics SL-1000MkII. Current. Big and heavy. EPA-100 arm really is a lovely bit of engineering too. Perhaps not as "musical" as the Garrard but tight and focused. Don't see this going anywhere unless I win the lottery (that would be one of the big SME's). Managed to find 2 original headshells on ePay.
Edit: Cartridges through the years.
Rega Bias (green).
Rega Elys (grey).
Tekni-Fi K1.
Goldring G800/G820.
Audio Technica AT95E.
Ortofon VMS30MkII.*
Ortofon MC20 Super.
Denon DL-103 (later in ebony wood body).
Rega Exact.
Ortofon SPU Royal N.
Jico SAS MM-1.*
Technics EPC-U205CMK3 (Jico SAS stylus).*
Denon DL-304.*
Denon DL-103R (in Midas metal body).*
Ortofon MC Jubilee (now with ESC Paratrace re-tip). Currently using.*
*Still have.
Only regret is selling the SPU Royal N but didn't have a proper arm for it at the time (and probably haven't had so far anyway - maybe the AT-1005 II?).