The speed control on the old units is to accurize for broadcast, recording and play back. Playback is last on the list in a non studio environment. If your recording FROM a TT the recording speed needs to be accurate.
Playing back not so much.. That's why Thoren's broadcast/transcription TT, the TD111, 121, 124, (224), 134, 135, 184 all have a speed control but the strobe is on their actual 121/24 (224). There is NO speed control on their non broadcast/transcription tables TD145-166 for a reason, it's not important for play back... Pretty simple reason...:-)
The old Load and Go TD224 was actually used to "Load (the rack with 3 or 4 records) and GO" (eat lunch or join the Christmas party) for a couple of hours. Some radio stations were on a budget I guess, no Reel to Reel. :-).
Remove the platters, clean the well pocket out real good with alcohol, clean everything, check the motor for excessive thrust and add a nock kit if it needs it. Clean and lube the motor. Polish the platter shaft ONLY. BrassO or ZERO abrasion Never Dull for the shaft. NEW well oil. I use Rislone engine treatment. Smells like good cleaning gun oil. 4-6 dollars a quart.. Slippery as snot.. Clean everything with alcohol the belt surfaces and motor pully.
I dust the inner pully with talc dust (powder). If its a new belt just let it warm in a window a give it a slight retention or two.. don't wipe off the belt if its new..
There is a cap or two that helps motor start.. you can replace them, good idea.. They start to go backwards then forward.. first sign of cap failure.
Gummy puffers (ear plugs) and spring kits... Inspect and replace as needed..
One trick I do for the ones I keep. I silicone the inside of the belt platter, it adds weight and is a super duper dampening agent..
Great light weight TTs.. I keep a 1/2 dozen around..