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Old 7th November 2010, 01:20 AM   #11
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Default Motors

Back in the seventies I worked as a mechanical designer for Scully Recording instruments in Connecticut. I worked on tape transport design and the preferred Hystersis Synchronous Motors at the time were from Ashland, Bodine, ELINCO ( Electric Indicator Company ) Papst and Beau Motor. They generally had sleeve bearings nearest the capstan for low noise and ball bearings at the far end. I still have a 2-speed ( 600 RPM & 1200 RPM ) Papst motor and a 300 RPM Beau Motor from those days. I bet they would make excellent motors to drive turn tables. Both are so-called
"inside out motors" I'm going to check out the companies I've mentioned
to see if they're still around. I know Papst is. This thread reminded me of
the fact that I still have those motors and it gave me the idea to possibly
design and build my own turn table. That is when I'm done with building
my own tangential tone arm. I'll report if I find out anything about the
companies I've mentioned.

Thanks,

Ralf
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Old 7th November 2010, 01:31 AM   #12
Pano is offline Pano  United States
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Really? We used a Scully tap deck in the radio station back in the late 70s. Loved it. We used it as our editing deck because of the great transport. Bravo!

And welcome aboard.
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Old 7th November 2010, 02:01 AM   #13
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Thanks,

Ralf
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Old 7th November 2010, 05:51 AM   #14
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Quote:
Originally Posted by Straight Tracker View Post
Back in the seventies I worked as a mechanical designer for Scully Recording instruments in Connecticut. I worked on tape transport design and the preferred Hystersis Synchronous Motors at the time were from Ashland, Bodine, ELINCO ( Electric Indicator Company ) Papst and Beau Motor. They generally had sleeve bearings nearest the capstan for low noise and ball bearings at the far end. I still have a 2-speed ( 600 RPM & 1200 RPM ) Papst motor and a 300 RPM Beau Motor from those days. I bet they would make excellent motors to drive turn tables. Both are so-called
"inside out motors" I'm going to check out the companies I've mentioned
to see if they're still around. I know Papst is. This thread reminded me of
the fact that I still have those motors and it gave me the idea to possibly
design and build my own turn table. That is when I'm done with building
my own tangential tone arm. I'll report if I find out anything about the
companies I've mentioned.

Thanks,

Ralf
If you can find a source for these motors newly manufactured, I know several people who want them. I make a driver designed to run this type of motor but it's too expensive for DIY types.
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Old 7th November 2010, 12:48 PM   #15
djn is online now djn  United States
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Hi All, first time posted in this forum. I am building a DIY TT and have a Rek-O-Kut K33 plate with the motor and bearing on the plate. I got the replacement gromets for the motor, but is there anything else I should do to the motor as I move forward?
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Old 7th November 2010, 02:25 PM   #16
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OK, so this isn't the most sophisticated means for driving a platter, but it works for me. ... Harman Kardon T35C servo-controlled belt drive TT driving the platter/bearing combo from an Immedia RPM-1. I used the HK's pitch control and a stroboscope to dial in the speed. The tape used to drive the platter is a composite of surgical and scotch tape, with the cloth side contacting the platters.

Just need to make it less cosmetically challenged.

Rube Goldberg would be proud.
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Old 8th November 2010, 07:25 AM   #17
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My current build uses nothing more exotic than a Rega subplatter/bearing assembly and Airpax motor. However, the design allows for easy replacement of both of these by virtue of a simple, easy to replace main subchassis and a separate motor subchassis which has both height and distance adjustment. In addition, the motor subchassis has its own suspension arrangement. I will get this set up working well before I start making any changes.
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Old 8th November 2010, 04:55 PM   #18
gtyler is offline gtyler  Canada
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Quote:
Originally Posted by Mark Kelly View Post
I make a driver designed to run this type of motor but it's too expensive for DIY types.
How expensive are we talking? I always thought that electrical components were rather cheap, what is the expensive part of it? Is the schematic available?
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Old 8th November 2010, 05:22 PM   #19
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Quote:
Originally Posted by Straight Tracker View Post
Back in the seventies I worked as a mechanical designer for Scully Recording instruments in Connecticut. I worked on tape transport design and the preferred Hystersis Synchronous Motors at the time were from Ashland, Bodine, ELINCO (Electric Indicator Company) Papst and Beau Motor. They generally had sleeve bearings nearest the capstan for low noise and ball bearings at the far end. I still have a 2-speed ( 600 RPM & 1200 RPM ) Papst motor and a 300 RPM Beau Motor from those days.
Hurst was another manufacturer. I don't believe that hysteresis synchronous motors are still in their line.
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Old 9th November 2010, 09:14 AM   #20
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Originally Posted by gtyler View Post
How expensive are we talking? I always thought that electrical components were rather cheap, what is the expensive part of it? Is the schematic available?
It costs me about $1k to build each one.

Yes, "generic" electronic components are pretty cheap, but you get what you pay for.
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