Jeg vil anta at du er rundt riktig årstall her. Men jeg tror mer på 1975 en 74. Dersom du ønsker eksakt så kan du sende Linn en mail på deres web sider.
Her er oppgraderingsstien til og med 2002:
1973 LP12 turntable introduced.
[ 2,000] 1974 Main bearing liner changed. Sub-chassis strengthened by addition of strap, spot welded in place. Motor control circuit changed from terminal strip to small pcb. Mains switch changed from two buttons to single with mains neon.
[23,000] 1978 Top plate modified adding two holes for 6x0.5 self tappers into wood block. <Linn claim Nirvana kit available this year>
[27,000] 1979 Lid propr removed and hinges changed to spring loading.
[32,826] 1981 February. Nirvana mechanical components. This consisted of :
1 new spring kit (3 springs & 6 grommets),
3 large locknuts, 6 small locknuts,
5 black chassis bolts,
2 motor mounting screws, domes, & nuts allowing it to be positioned with better accuracy.
1 motor thrust bearing kit (endcap, spring, ball bearing).
1 new drive belt.
The springs changed from zinc coloured to black.
[38,794] 1982 May Valhalla crystal driven electronic power supply made standard.
[53,000] 1984 Enlarged plinth corner bracing.
[54,101] 1984 June. Sub-chassis strengthening bar epoxy glued instead of spot welded.
[60,383] 1985 August. Cap head screws on bearing housing.
[61,090] 1985 September. Diode modification to Valhalla.
[n/a] 1985 December. Strengthening blocks on corners of plinth.
1986 Suspension springs improved.
[n/a] 1986 May. New clear lid.
[69,161] 1987 March New Formica and MDF armboard.
[n/a] 1987 March New bearing housing.
[69,591] 1987 April New springs.
[70,000] 1987 Bearing improved with better lining material and tighter tolerances. Change to black oil. Suspension springs ground to improved tolerance. Arm board composition improved.
[79,160] New MDF armboard, laminated top and bottom.
[79,700] 1989 Motor thrust pad changed. Valhalla surge guard modification. PCB mains lead (UK).
[81,000] 1989 Harder suspension grommets fitted.
[n/a] 1990 Lingo power supply available as add-on.
[87,047] 1991 Valhalla with 45.
[87,047] motor thrust pad cap added to Lingo models.
[87,206] motor thrust pad cap added to Valhalla models.
[87,672] Introduction of LP12 Basik, Trampolin available.
[87,672] Solid base board replaces hardboard.
[88,950] 1992 Improved top plate fixing.
[90,582] 1993 Cirkus upgrade fitted as standard.
[n/a] 2002 Adikt moving magnet cartridge introduced. Maple plinth introduced adding to existing black, cherry, walnut, rosenut and afromasa options.
Ref:
http://www.n.mackie.btinternet.co.uk/linn/tlp12faq.html