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AR EB101 turntable

Posted: 11 Aug 2019 00:04
by michael maurice
I was asked to look at this turntable because the belt kept slipping off and sometimes the motor went backwards.

I obtained a new oem belt which was 186mm diameter, 4mm wide, but there isn't enough torque for the motor to start it.

I've also replaced the 0.82uF capacitor with an X2 275V replacement.

I presume the motor has failed. Can it be repaired, if so how, if not what is a suitable replacement? I'm in the UK so electric supply is 240V 50Hz.

Re: AR EB101 turntable

Posted: 31 Aug 2019 16:57
by MikeyB456
The EB101 in the UK came in at least 2 variants. Early ones had a plinth with a frame-like construction, and (I think) had a 12-pole motor. Later ones had a plinth with an all-over black vinyl 'veneer', and a 24-pole motor. The pulley size is therefore different, and so the belt size is different between the two.

So my first question is: which version do you have, and do you have the right belt?

As to the motor not having 'enough torque' - does it stall? It might if the belt is too tight. Alternatively, it might be that the belt is simply slipping on the pulley. In this case, coating the belt with talc is recommended to improve grip for start-up.

The belt will slip off if the subchassis isn't level, or if the motor spindle isn't properly vertical. The subchassis can be levelled by adjusting the nuts on the spring support bolts. The motor can be levelled by shimming its support bracket. It's fairly easy to see what's going on if you fit the platter upside down.

HTH!

Re: AR EB101 turntable

Posted: 31 Aug 2019 17:22
by MikeyB456
Here are pics of the two versions:
large pulley.jpg
Large pulley
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small pulley.jpg
Small pulley
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Re: AR EB101 turntable

Posted: 31 Aug 2019 17:53
by lenjack
Many folks still think the original iteration AR table was the very best of the lot, and was/is unsurpassed.

Re: AR EB101 turntable

Posted: 19 Nov 2019 14:32
by bpjanitor
I picked up this EB101 from an estate sale on eBay. The pulley is damaged and I am trying to find a new one. I purchased a new pulley from Vinyl Nirvana only to find it was way bigger than the one on it. After removing the bottom cover, it would appear that someone had replaced the motor. Dave at Vinyl Nirvana was stumped and suggested I post here to try and identify it. Not being familiar with the EB101 I'm also wondering if the plinth and suspension has been changed. If anyone has any ideas, please share. Thanks!
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Re: AR EB101 turntable

Posted: 19 Nov 2019 16:32
by derspankster
I am not that familiar with the EB101 but even the T-bar on this one looks all wrong. Kind of looks the original pressed steel type found in the earliest AR TA.

Re: AR EB101 turntable

Posted: 19 Nov 2019 18:05
by MikeyB456
The T-bar is like the one on the UK model. The plinth is not like the UK plinth though.

The pulley size suggests to me that the motor is a 12-pole rather than a 24-pole type. Can you see the model number of it under the bracket somewhere?

Re: AR EB101 turntable

Posted: 19 Nov 2019 20:54
by bpjanitor
MikeyB456 wrote:
19 Nov 2019 18:05
The T-bar is like the one on the UK model. The plinth is not like the UK plinth though.

The pulley size suggests to me that the motor is a 12-pole rather than a 24-pole type. Can you see the model number of it under the bracket somewhere?
The motor appears to be the same one used in Revolver TT as near as I can tell. Here is the motor model number.
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While pulling the bracket off the motor I also notice the RCA leads have been changed out with an AV cable with the Yellow lead cut off. It may be a custom plinth as the sides are MDF but the top is some sort of hard wood. Pictures I've seen of the EB 101 suggest it is made out of some sort of particle board. The finish is sloppy with fingerprints and runs which would also suggest home made.

Re: AR EB101 turntable

Posted: 19 Nov 2019 21:53
by MikeyB456
I'm pretty sure that makes it a 12 pole motor, which would rotate at 600rpm on 60Hz mains, as opposed to a 24-pole motor which would rotate at 300rpm. So it would need a pulley of half the diameter. Is the current pulley unusable?

Certainly the UK EB101 has a particle board plinth, so yours sounds like it's been 'custom' built.

I don't like the sound of those RCA leads. They don't seem likely to be the low-capacitance type a TT really needs.

All in all, you have a bit of a project there!

Re: AR EB101 turntable

Posted: 20 Nov 2019 13:17
by bpjanitor
MikeyB456 wrote:
19 Nov 2019 21:53
I'm pretty sure that makes it a 12 pole motor, which would rotate at 600rpm on 60Hz mains, as opposed to a 24-pole motor which would rotate at 300rpm. So it would need a pulley of half the diameter. Is the current pulley unusable?

Certainly the UK EB101 has a particle board plinth, so yours sounds like it's been 'custom' built.

I don't like the sound of those RCA leads. They don't seem likely to be the low-capacitance type a TT really needs.

All in all, you have a bit of a project there!
Actually, it's more of a cosmetic thing with the pulley. The belt seems to track okay. Yes, it does appear to be a "custom" build, but he sure could have done better! It is turning into a project! We'll see how it turns out. Thanks for your input!

Re: AR EB101 turntable

Posted: 12 Dec 2019 12:29
by andyshirt-1
Hi I seem to have the same problem with my EB101 UK edition which has the large pulley. When started it can go backwards or forwards at randem. The speed is fine and no staggering and if you give the platter a slight push in the right
diretion as you press the start button all is well. It is nothing to do with the belt it is the pulley that is changing direction.
Can I therefore assume that the motor is at fault and can anybody sujest a replacement or upgrade.
Thanks to you all out there for any help.

Re: AR EB101 turntable

Posted: 12 Dec 2019 13:44
by MikeyB456
Hi,
So the good news is that it's not the motor itself.
My understanding is that this is caused by the failure of the 'phase shift' capacitor on the little circuit board inside the plinth. Do some searching around the forums for more details, but it's an easy fix if you know how to solder components.

Re: AR EB101 turntable

Posted: 12 Dec 2019 15:07
by lenjack
Welcome to our forum.

Re: AR EB101 turntable

Posted: 12 Dec 2019 20:50
by MikeyB456
Hi Lenjack, absolutely - I was forgetting my manners!