flavio81 wrote:Alec124c41 wrote:It looks like it has an optical readout of the tonearm position.
SPOT ON. More exactly, i bet it's for measuring how much wow is present (how much off-center is the record).
The strobe lamp is on another position. A common lamp bulb is useless for strobe. You need a neon bulb or a xenon/flash bulb.
If you look at which way the lamp is pointed, you see a condenser to focus the light, a mirror to reflect it upward, a transparent scale attached to the bottom of the tone arm, then a mirror to reflect that across the deck, and another to reflect it upward. There should probably be a lens and a ground glass screen there.