Dual 1019 - Antiskate working even at 0 value

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Solist
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Dual 1019 - Antiskate working even at 0 value

Post by Solist » 18 Sep 2018 20:11

Anyone knows what would cause this problem?

Even if I set the AS to 0, there is a noticeable pull outwards.

Patrice Brousseau
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Re: Dual 1019 - Antiskate working even at 0 value

Post by Patrice Brousseau » 18 Sep 2018 23:37

Antiskate is out of calibration. I know that DualCan fixed mine but I don't what's the correct procedure.

Spinner45
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Re: Dual 1019 - Antiskate working even at 0 value

Post by Spinner45 » 19 Sep 2018 00:43

Patrice Brousseau wrote:Antiskate is out of calibration. I know that DualCan fixed mine but I don't what's the correct procedure.
Ah, no, sorry, that's not the problem.
Let me educate you a little....

As things age, they get stiff.
The insulation on the tonearm wiring tends to stiffen up due to aging.
So since most of the time to tonearm is on the rest post, the insulation naturally "molds" into that position under the chassis.
Since the tonearm bearings are free, the slight "twisting" stress of the wiring can and does pull it back to the rest.
Nothing to really be alarmed about.

Patrice Brousseau
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Re: Dual 1019 - Antiskate working even at 0 value

Post by Patrice Brousseau » 19 Sep 2018 01:23

Ah, thanks for the clarification! However, my antiskating was really a little de tuned on the 1019...

Solist
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Re: Dual 1019 - Antiskate working even at 0 value

Post by Solist » 19 Sep 2018 09:21

You were right Spinner.

This turntable was serviced before (copper disc in the motor is worn on both sides) which made me think the repair shop fiddled with the AS.

I managed to fix the issue by releasing the tonearm wires a bit. They probably had too much tension going from the tonearm to the clip that holds them into the chassis.

I also gently pushed the copper piece to which the AS spring is attached a couple of times in the opposite direction in regard to its movement.

This sorted the issue :)

DSJR
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Re: Dual 1019 - Antiskate working even at 0 value

Post by DSJR » 19 Sep 2018 14:29

When set to 'zero,' the inner adjustable mount for the spring should have the spring's end exactly in line with the horizontal bearing axis, so it has no effect at all on the arm movement. Mine had a little stiction here with age and this had a slight effect on free tonearm movement (the blowing arm sideways test as recommended back then ;) ), but this was soon cleared.

Binding tonearm wires IS an important thing to check obviously and Dual are very neat in their cable dressing, so ample opportunity for these wires to 'take a set' where they exit the arm underneath.

bhuston
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Re: Dual 1019 - Antiskate working even at 0 value

Post by bhuston » 20 Sep 2018 00:28

...which clearly indicates that they should be played regularly, not stored :D

Spinner45
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Re: Dual 1019 - Antiskate working even at 0 value

Post by Spinner45 » 20 Sep 2018 05:08

Without going all too nuts about this, and there's been threads before about it, here's some facts...
On a Dual, and likely on any good tonearm, the horizontal friction is somewhere around 0.01 grams - an extremely small value.
The average antiskate force on it for a tracking force of 2 grams is around 0.4 grams.
So that tiny amount of "spring-back" caused by tonearm wires can be enough to cause a deflection of the tonearm when balanced at "0".
Again, nothing to really worry about as long as they allow free movement to play a record.

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