S/N above 31,826 1981 February.
Up to following mechanical:
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.
The Vahalla was introduced slightly later, only after [38794], but that does not exclude a possiblity that the owner upgraded. Look below, if there is not complicated circuit board, you have the Basik motor (or a square big on/off button; Vahalla has a touch-on/off black button with a small LED).
Always can post Linn issues if not already cover in my site.
Extremephono.com