Take a tiny screwdriver and feel the bottom of the receptacle. If there is a bearing you’ll feel the roundness peaking in the center. I can’t remember if there is one, or not.
Of the three models in this era I’ve owned (GP2, 432 and 440. all ran at 2gm. when counterweighted and the other steps taken.
Going extra cheap compromised a good arm design..
RobNYC On Saturday, January 21, 2023, 01:06:34 PM GMT-5, Nigel Pugh via Jukebox-list jukebox-list@lists.netlojix.com wrote:
Can anyone tell me please is there a bearing in the bottom of the brass tone arm pivot ? I cant tell with a torch if it's actually a bearing or an indent ?
The reason I ask is, I have 3 of these arms and each one seems to have the same problem, there is too much horizontal friction in that bearing and the stylus cantilever is pulling the arm, so when you watch it close up it looks like the cantilever is doing a little dance to the let and right.
I'm experienced in tonearm setup and have ruled out everything other than friction in that shaft.
1. Pivot shaft flushed clean with IPA and lighter fuel, spotless
2. Tonearm cable removed completely
3. Trip switch removed
4. Tracking set with digital guage between 2 and 7 grams (Shure M44MR original cartridge)
5. This issue usually occurs when attempting to track a cartridge at the lighter end of it's spec, or with stiff tonearm cable
6. If I track at 7 grams it's ok, but that's definitely not right. Should be 3 to 5.
7. Tried with kiddie spring and also counterbalance
8. Used various new and used styli, M44C and domestic M44-7
I've got 7 jukeboxes and 8 turntables and by a long shot this arm has infinitely more friction than all of them. And all 3 variants of this arm do also, hence asking if there is or should be a bearing in the pivot.
Or, is it just a really bad design ?
Any ideas ?
I've had this 470 for around 30 years and only discovered this when I realised the crappy arm spring had stretched over time and was tracking on the lightest setting at 7g. So I made a counterbalance and that's how it's come to light that the arm don't like tracking below 7g. It also sounds much better at 7g. Something isn't right so I'm looking for an outside of the box thought or a sensible modification. Maybe there's nothing wrong at all and it's just a rubbish design. I did think about dropping a bearing into the shaft but haven't got one to hand.
Nigel, uk
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