Got the amp working easy enough and sounds pretty decent- https://www.youtube.com/watch?v=bEtvu4ldFts but didn't have a lot of hope for the original motor after retensioning the brushes still not able to get continuity and the commutator looked burned, so decided to repower with a Mabuchi RC280 RC car motor, turns out these are just a purrfect 24MM diameter case and 2.0mm shaft size compared to the original-
The resulting speed achieved was ~22-1/2 RPM so I thought about it for a day or two while I have been waiting for a couple other motor choices, ~$2-$3 free shipping from China!
But tonight I thought about ways to increase the speed with a sleeve over the motor shaft and picked a piece of PVC ~18ga wire insulation which got me close to the right speed, but adding a piece of shrink tubing over that made it just about the right speed at the top of the range https://www.youtube.com/watch?v=85gdEytzZac The case cleaned up quite a bit with my favorite lanolin hand cleaner, a nice brush and a moist rag.
PWM controller and lower voltage motors coming soon, this one was advertised as "3, 6, 9, 12V . . . " 17,000 rpm . . .YMMV
funny the 1.5" x 1/4" record adapter seems to have swollen over time and no longer fits the center holes :-( Time to chuck it in the lathe and do some sanding and polishing!
(This post was last modified: 12-05-2019, 02:00 AM by PhilcoFordTesla.)
Thanks, sounds pretty terrible but if I can find a better solution for motor speed than a piece of shrink tubing it might help the WOW factor , but it sure sounds a lot better with an external signal! Maybe time to try one of these cartridges in another RCA player, did one a few years ago and don't recall it sounding much better though lol.
Sounds even better tonight with this little PWM controller, running here from ~7 volts but it runs well off of a single 3.7V cell. Need to pick up some Alkaline D Cells but they get like $2 apiece now so ordered a 12 pack on ebay if I don't decide to run it off the 18650's with some little regulator modules on order . . .
so I thought about it for a day or two while I have been waiting for a couple other motor choices, ~$2-$3 free shipping from China! 
https://www.youtube.com/watch?v=85gdEytzZac The case cleaned up quite a bit with my favorite lanolin hand cleaner, a nice brush and a moist rag.
, but it sure sounds a lot better with an external signal! Maybe time to try one of these cartridges in another RCA player, did one a few years ago and don't recall it sounding much better though lol. 
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