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Sony 2250 motor

68.183.27.48
Posted on November 5, 2009 at 13:27:27
crubio
Audiophile

Posts: 5
Location: no.cal
Joined: May 23, 2006
 I wanted to run my Sony 2250 with a Wave Mechanis from Nottingham.

Anyone know if this is possible? I took it apart and found 6 wires running
into the motor. 2 Magenta, 1 black, 1 green, 1 stripy green, 1 stripy black.

Thanks,

Crubio

RE: Sony 2250 motor, posted on November 5, 2009 at 18:01:48
JimL
Audiophile

Posts: 3349
Location: New Mexico
Joined: November 24, 2002
 The Sony 2250 is, as far as I know, a DC direct drive turntable, which means that the motor must be driven by a DC voltage. The turntable has a built in power supply which takes the AC power line voltage and current to produce the DC voltage for the motor. Since the Nottingham Wave Mechanic is an AC power supply, which generates a clean AC wave from the AC power line, it cannot directly drive the Sony DC motor, but can only supply the AC voltage for the built in power supply. Therefore what you need to do is reassemble the wiring of your turntable motor, then plug its power cord into the Wave Mechanic. However, since the built in DC power supply already provides a good deal of isolation of the motor from AC line problems, which is what the Wave Mechanic is designed to do for AC motors, you may not hear much difference, if any.

RE: Sony 2250 motor, posted on November 6, 2009 at 11:26:46
crubio
Audiophile

Posts: 5
Location: no.cal
Joined: May 23, 2006
 Hi Jim,

Thanks. That's very accurate and obvious. I should have know.

The reason I've been looking into this is the speed issue, it always starts running fast. I don't think the Wave M would solve this, unless I can bypass the internals.

Thanks

RE: Sony 2250 motor, posted on November 6, 2009 at 09:36:40
majick47
Audiophile

Posts: 181
Location: Pembroke MA
Joined: June 27, 2006
 JimL from your reply it sounds like you have quite a bit of knowledge re the Sony PS-2250. I have a Sony PS-2251 with a Grace 707 tonearm which uses the same motor/different base. It's sidelined at this time after experiencing speed issues, hopefully a cleaning of the speed pots will cure this. Other than that have you had to update any internal parts, caps etc due to age? I have the owner and service manuals and if service/updates are needed I'll have to find a competent tech to work on it. Since it's 1970 vintage I wouldn't be surprised some upgradeing may be required to get it back to spec.

RE: Sony 2250 motor, posted on November 6, 2009 at 12:31:40
crubio
Audiophile

Posts: 5
Location: no.cal
Joined: May 23, 2006
 Hello,

Which are the speed pots? and Could I get a copy of the service manual from you?

Thanks

RE: Sony 2250 motor, posted on November 6, 2009 at 18:11:46
majick47
Audiophile

Posts: 181
Location: Pembroke MA
Joined: June 27, 2006
 crubio I can make a copy of the service manual. PM me for further info.

RE: Sony 2250 motor, posted on November 6, 2009 at 10:17:26
JimL
Audiophile

Posts: 3349
Location: New Mexico
Joined: November 24, 2002
 Actually, I've never laid eyes on one, just going by what I can find on the Internet. :-) All the DD tables used DC motors so it's not much of a stretch to make a general recommendation. Since the 2250 series is now 30 years old or more, its power supply, like any electronics from that time, would benefit from replacing all electrolytic caps, at a minimum. For example if you do a search for refurbishing a Technics SP-10, which also comes from that era, that is pretty much a standard thing to do.

RE: Sony 2250 motor, posted on November 6, 2009 at 18:08:30
majick47
Audiophile

Posts: 181
Location: Pembroke MA
Joined: June 27, 2006
 JimL I had a feeling that my Sony SP-2251 would need an overhaul due to being about 40 years old much like the SP10 of the same era.

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