Phonoland

With all the posts recently asking for help, I figured I'd ask one about history!

So I have an MM6, with the 'Autospeed' adjustment. My motor has it's drive shaft stepped down - so that the larger size is in use when the juke's playing a 45, but when a 33 comes up, a solenoid lifts the idler wheel to the smaller diameter portion of the shaft, slowing the turntable down.

Now, back when I was having issues with my motor, and was looking for replacements, I came across two different styles -
One, was like my motor, with the stepped shaft.

The other, however, seems to have a 'spring' around the drive shaft, pictured below. (Not my image, stolen from an auction..)

If you look at the top of the shaft, you'll see what looks like a tightly wound wire around the shaft.

What's the story between the two types? Does the latter one not support Automix? Is that a 'modification' or some kind of fix?

That 'spring thing" was how a 60Hz turntable motor was used on 50Hz. There may be another reason, but in jukeboxes that was how it was typically handled.

Rob

Yes it is a speed spring used on European jukeboxes, they also had a 33.3 speed spring fitted if the 1100/1200 mechanism played dual speed.

Regards
Alan

Alan Hood
ami-man
UK

Oh, well, that makes a lot of sense - duh.

So the same motor was used in all jukes (domestic and international) had the same motor, and just applied the speed spring or not?

Are the springs removable and/or can an owner (route tech) put one on / take one off in case the juke needed servicing?

--Mike

I have removed them--but would be un-able to reattach it, reliably, as they all stretched while removing--suppose a new one would "slip on" with the help of a little lube, of some kind ? Ron Rich

Ron Rich wrote:I have removed them--but would be un-able to reattach it, reliably, as they all stretched while removing--suppose a new one would "slip on" with the help of a little lube, of some kind ? Ron Rich

Ron, on occasion during service of record changer motors, I've had some with the "spring" wrap for the 78 RPM step on the shaft.
The best, and non-destructive way to remove or insert the springs is to carefully "grip" the "cut" end of the last loop and turn it (unscrew it) against the way it was wound.
A pair of "nippers" or flush-cut wire cutters make a good tool for this.
This "opens up" the diameter of the spring, and eases the tension on the motor shaft, allowing it to slowly slip off the shaft without damage.
Oh, and if cleaned of dirt or debris, no "lube" is needed or required.

MattTech wrote:

Ron Rich wrote:I have removed them--but would be un-able to reattach it, reliably, as they all stretched while removing--suppose a new one would "slip on" with the help of a little lube, of some kind ? Ron Rich

Ron, on occasion during service of record changer motors, I've had some with the "spring" wrap for the 78 RPM step on the shaft.
The best, and non-destructive way to remove or insert the springs is to carefully "grip" the "cut" end of the last loop and turn it (unscrew it) against the way it was wound.
A pair of "nippers" or flush-cut wire cutters make a good tool for this.
This "opens up" the diameter of the spring, and eases the tension on the motor shaft, allowing it to slowly slip off the shaft without damage.
Oh, and if cleaned of dirt or debris, no "lube" is needed or required.

Hah! Awesome then! Good to know!

Yes--that works if not glued on with good glue ! Ron Rich