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In Reply to: RE: Could this be the explanation? posted by hesson11 on January 18, 2010 at 17:46:39
Which makes this all the more mysterious. Not sure why he's so hellbent to defend them.
"I'll play it and tell you what it is later..." - Miles Davis
Vynyltap's System
Follow Ups:
BK owns 2 Jelco arms NT
you have none listed in your profile. You seem to be going under the assumption that I'm trying to be a jerk here - it's not my intent.
"I'll play it and tell you what it is later..." - Miles Davis
Vynyltap's System
Edits: 01/19/10
Your whole contribution here has been antagonistic, packed with clever dick remarks and comments which were based strongly on bold CAPTILISED assertion and not ACTUAL FACTS. EG "the pins touch", "the cartridge cant be moved any further back", "the effective lenght is 236mm", "the length of the headshell slots has zip to do with it" etc etc - all these points are wrong.
I don't own an SA 750D and never claimed to own one. I have two SA 750L tonearms, an Audioquest PT9, a Graham Robin, and a Grado Reference - all of which were made by Jelco.
You measured the technical drawing provided with the tonearm and concluded that the tonearm was out of spec, but you forgot to check if the drawing is produced accurately to scale - it isn't.
Put the mounting template (which is accurately to a 1:1 scale) over the technical drawing; hold the two drawings up to the light and try to line them up. They don't line up. So you can't make conclusions from measurements on the drawing.
As regards your pictures - you didn't show the headshell from the side, your pictures are shot at an angle, but it looks to me that your stylus falls close to the front of the headshell and a one or two mm ahead of the point for an effective length 229mm. Roughly, consistent with your deduction that the effective length is 232mm and roughly consistent with the tonearm drawings.
If you had started out by saying that a user might just as well mount the tonearm at a greater distance than the manufacturer's recommended value, then I would have agreed.
The extra long slots in the headshell allow the tonearm to be mounted anywhere from ~211mm to 222mm, and for alignment still to be possible.
It's a benefit, not a drawback.
If you want the cartridge bolts to fall right in the middle of the slots, for null radii at 66mm and 121mm then you should mount the tonearm at ~216mm
BK
And by the way, I certainly don't need to prove my credentials to you.
'nuf said. It doesn't matter if the drawing is to scale - all I need to use are the printed dimensions on the drawing in comparison to the ACTUAL ARM SITTING IN FRONT OF ME to know they're incorrect.I'm using caps in hopes of getting it to sink in. Yes, I'm now being an ass and with good reason.
Answer the one post you haven't so we can be done with this. Simply and plainly explain how I'm able to achieve 232mm effective length with the stylus several mm's BEHIND the specd 229mm mark. If I'm wrong I'm man enough to freely admit it. Are you?
"I'll play it and tell you what it is later..." - Miles Davis
Vynyltap's System
Edits: 01/19/10
"Yes, I'm now being an ass" that's correct you are. NT
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