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XA/B least expensive method to introduce speed control?

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XA/B least expensive method to introduce speed control?

Postby plexi » 11 Oct 2017 09:28

Is the music hall 2.0 the least pricey or even the only solution for making the old ARxa/b able to do speed control? or is anyone making a DIY controller for them? I'd like to keep my AR but the need to adjust speed between records is becoming essential. At the same time, I'd rather not spend hundreds to do this? any inexpensive options?

also, if a table is running slow, is there an issue with relying on the speed control to increase that speed or is a slow table (noticeably slow) indication of unhealthy motor? I have new pulley and oiled spindle - have not oiled motor as have not reearched the exact how to yet)

thanks
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Re: XA/B least expensive method to introduce speed control?

Postby snfrosten » 13 Oct 2017 02:10

The Music hall is the cheapest easiest way to control the speed and lets you select the 33/45 speed without changing the belt on the pulley.
Table shouldn't be running slow, the motor is set at the right speed. It is either the wrong belt or the platter bearing well is not letting the platter spin freely. Which motor and subchassis do you have? The stamped steel sub with the Delrin bearing are notorious for seizing up and causing the platter to slow down, platter should spin freely for at least a minute or two with no belt on.
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Re: XA/B least expensive method to introduce speed control?

Postby plexi » 13 Oct 2017 09:04

thanks for info. Does this tell whether either part is the one you mention? the only marking on the main silver motor says 6-520

Delrin is a kind of plastic no, the center sleeve appears to be metal?
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Re: XA/B least expensive method to introduce speed control?

Postby noisefreq » 13 Oct 2017 22:43

You have the later, metal bearing wells, which is good.
There is a delrin disc that is a round flat white plastic disc in the bottom of each bearing well.

These wells, the ball bearing under the tonearm and the discs should be cleaned and oiled properly.

The belt should be just tight enough to hold on the inner platter when in use. If you have to stretch it on, it's too tight.

Oiling the motor is just a matter letting a drop or two of oil soak into the top of the motor spindle as it's running.

Like you're thinking, I would sort out the slow rpm problem before I went and spent money on a speed control.
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Re: XA/B least expensive method to introduce speed control?

Postby derspankster » 14 Oct 2017 14:03

Good advice.

der
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Re: XA/B least expensive method to introduce speed control?

Postby plexi » 15 Oct 2017 00:55

the new belt was bought on ebay from a reputable AR dealer it seems..I once measured the belt against common wisdom I found on google and it was a match it seemed. It does feel a bit tight to my senses but I really don't have any reference of known tension, just a general feeling...
found this thread, and am reading to learn how to pry off covers and add motor oil. the silver motor on mine seems to be/have been soldered on?

viewtopic.php?f=34&t=64051&hilit=oil+motor
Garard 401 stanton881s rega rb303, Thorens125/Acos Lustre grado G, AR XA rega 200 ShureV15III MR, Lenco l70 rega rb202 Stanton881s, LCR loungeMM preamp
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Re: XA/B least expensive method to introduce speed control?

Postby derspankster » 15 Oct 2017 13:40

If the belt feels tight then I'd guess it is. Might be short or might be too thick - or both. My belts came from Vinyl Nirvana and are correct. I have no experience with 2 motor XA's. Both of mine are single motor. I added a drop or two of oil to the shaft of of one of mine because it was a bit noisy.

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