using an akai reel motor as turntable drive?

[federico moreno]

...the stator:

 

[federico moreno]

...and the rotor:

 

[lcsaszar]

I used this Papst motor in my turntable (originally from a Studer pro tape recorder) connected for 500 RPM. It worked quite well.

 

[federico moreno]

Good, Oshifis! that motor has support from beneath (the U metal part in which the rotor rests...)
I think that is well suited for vertical use...

Is speed constant? Are you using a controller?

 

[federico moreno]

...testing the capstan motor...

...now I´m running on this:

 

[federico moreno]

brakes

May be some of the wires coming out of the motor are for the brake?

a little further investigation😛reliminary, in akai gx-255 braking is performed with solenoid and friction pad...

 

[Straight Tracker]

Hello federico moreno

Thanks for the additional information. It seems like that motor is not a mystery anymore.

The part you refer to as a grommet is an "external snap ring" or an "e-clip"
I guess because it looks like the letter E.

Sincerely,

Ralf

 

[federico moreno]

Thanks for the data too, Ralf.

E-Clip... clever...

And I was suggesting omega, LOL!😛

Now that you told me that, I remembered that here in Argentina that kind of grommet is called circlip...

Back to motors: after some painful inspection of the Akai pcb diagram, I discovered that the reel motor is a 120 Vac part... I was feeding it 40 Vac, go figure...
I´ll do further testing soon with another trafo.

Now I´m enjoying the capstan motor, @ 40 Vac... a little cumbersome and overpowering (is as big as the turntable, hahaha!), but smooth as silk.

Thank you very much for your input.

 

[lcsaszar]

Good, Oshifis! that motor has support from beneath (the U metal part in which the rotor rests...)
I think that is well suited for vertical use...

Is speed constant? Are you using a controller?

I don't use it any more, I bought a Thorens TD-160 Super for dirt cheap 😀 That Papst motor had huge torque, so it ran nearly sync to the mains frequency, which is quite accurate 50 Hz in my area. With 500 RPM I could use a large diameter pulley, which was easier to machine to precision. The motor had some vibration, so I played a lot with the suspension, and could not eliminate it entirely. My home-made turntable looked like this, but it had some basic construction problems, and I don't have it any more:

http://tube.fw.hu/lp3.jpg

 

[federico moreno]

...diy turntables are a never ending quest...

I don't use it any more, I bought a Thorens TD-160 Super for dirt cheap

..and sometimes. something appears that throw away all the effort.

What´s that platter in the diy TT? looks massive...

Besides, I´ve never heard the TD-160, but a friend of mine who lives in Spain has one, and is extremely happy with it.

I have a TD-125 from 1968/69, armed with sme 3009: a nice and classy machine. But i seldom use it, because with the diy TT I enjoy tweaking as much as music😉

There are other turntables around: a Barthé Rotofluid, a belt drived french affair, simple and effective as a Citroen. I´ve modified the tonearm bearings, putting ball bearings instead the v-blocks a la Lenco that it had.
The Barthé has a tiny synchronous motor which is identical (and maybe the same) as the motor in TD-160. Excellent stability and very good start up...

And the Sincron..., a reliable and powerful domestic turntable -it was made here in mid seventies-: an idler wheel with a powerful induction motor and very engaging sound.. in it´s time, Sincron TT´s were DJ and radio station workhorses. Audio snobs here tend to dissmis those excellent TT´s, but with care they are on par with a good Lenco: