Just finished examining the Thorens turntable in detail…
First I noted that the right hand side of the tonearm is pivoted and snaps into play position held in place by a spring loaded steel ball that pushes into a hole on the opposite fork of the tonearm. This is to allow the cartridge to be turned upright in order to make replacing the needles easy.
Removing the case’s bottom wood panel revealed just how heavy-duty and ROBUST the turntable motor’s construction is (photo below)! The motor’s housing is heavy gauge cast steel, like nothing I’ve personally ever seen before in vintage “consumer electronics”.
The motor has an ID plate which specifies:
Thorens Switzerland; Fab.(rication) Suisse; Type: RAI
N° 24623; W(atts) 15 W.
V(olts): 100-220; 50 ~ 60
After that with the cartridge pivoted up into the “needle replacement” position the following inscription on the cartridge’s underside can be read:
Made in Switzerland
Brown Boveri Crystal
(see photo below)
There doesn’t appear to be any model or serial number; but perhaps there’ll be one inside the cartridge when it’s dismounted or taken apart.
BTW the inscription “Brown Boveri Crystal” was intriguing to me. Swiss multinational heavy industry Brown Boveri is Switzerland’s biggest company; but I never associated them with crystal cartridges before… rather with railroad locomotives/wagons, heavy armament, mega power generators, turbines, etc.
Finally measuring the electrical resistance/continuity across the cartridge showed that the circuit is broken. But with the help of a flashlight I discovered the word “CRYSTAL” imprinted into the side of the tonearm (photo below).
Moving forward I’d be grateful for 1) Any historical, technical, etc. information you could give me about this particular Thorens turntable 2) Does anybody (HOPEFULLY!) rebuild crystal cartridges like this one… and if not (in the worst case) what would be an appropriate available cartridge for playing shellac 78rpm mono records that I could adapt into the tonearm’s 55 mm diameter by 17 mm deep opening for the cartridge?