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Wurlitzer 12 selection speed flutter
Ken Doyle wrote:
Hi. I finally rebuilt the amp in my Wurlitzer 412. The bear-claw arm and magnetic cartridge actually sounds pretty good, though I may upgrade it later so I can put some of my better records in without wearing them out. I lubed the changer with oil (marvel mystery oil) and it works very well, but I've got quite a bit of flutter in the speed. The motor runs smooth and the leather coupling looks ok. It's not too slow, but the flutter is quite noticeable. What causes flutter in the speed on this machine? Do some of the gears need a thicker grease? Thank you, Ken D. A worn turntable shaft and/or bushings in the mech can cause it to wobble. Also, is your juke by any chance converted to play 45's? At the lower RPM's, the problem is much more noticable. I had one that the owner wanted left on 45 rpm and the only way to get steady turntable speed out of it was to add a bunch of stick on lead weights on the inside of the sides of the turntable. It did WONDERS to help regulate the speed of the turntable. I think the weights I used are made for balancing mag wheels so you can find them at most car parts stores. -- Tony |
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#2
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Hi. I had a good look at it today.
The turntable shaft has a little bit of play, not much. Would this cause flutter? The leather couplers seem fairly soft, but I don't think they're totally straight since I see a little up and down movement in the shaft. Is there a kit to rebuild them? Looks like they have to be just right. Opinions appreciated! Thank you, Ken D. "Tony Miklos" wrote: Hmm, I think I was thinking of "wow" instead of "flutter". But who knows, the weight could still help. Profesional turntables like out of an old radio station are very heavy for this reason. The more mass, the less likely it is going to vary in speed. Is the leather coupler soft? I imagine if it's dry and stiff it could be a problem. And how about play between the gears on the TT shaft and the gear that drives it? Did you check to see, while the turntable is up all the way, if it wobbles at all? If so, that takes us back the the tt shaft and bearings. I've seen half ass bearing fixes by taking a metal punch and peening the brass bearing. -- Tony Ken Doyle wrote: Thanks for the reply. My machine is not converted, it's playing 78s. The turntable weight idea is interesting. I notice that if I drag my finger on the bottom or the turntable the flutter goes away. "Tony Miklos" wrote: A worn turntable shaft and/or bushings in the mech can cause it to wobble. Also, is your juke by any chance converted to play 45's? At the lower RPM's, the problem is much more noticable. I had one that the owner wanted left on 45 rpm and the only way to get steady turntable speed out of it was to add a bunch of stick on lead weights on the inside of the sides of the turntable. It did WONDERS to help regulate the speed of the turntable. I think the weights I used are made for balancing mag wheels so you can find them at most car parts stores. -- Tony Ken Doyle wrote: Hi. I finally rebuilt the amp in my Wurlitzer 412. The bear-claw arm and magnetic cartridge actually sounds pretty good, though I may upgrade it later so I can put some of my better records in without wearing them out. I lubed the changer with oil (marvel mystery oil) and it works very well, but I've got quite a bit of flutter in the speed. The motor runs smooth and the leather coupling looks ok. It's not too slow, but the flutter is quite noticeable. What causes flutter in the speed on this machine? Do some of the gears need a thicker grease? Thank you, Ken D. |
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