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In Reply to: Re: Stylus Shape: Spherical vs Elliptical? posted by John Elison on September 16, 2006 at 06:16:37:
"It doesn’t matter which end of the tonearm you move up and down. The change in VTA/SRA will be exactly the same for an equivalent amount of movement."I understand that. It's just a way of pointing out the small difference between the record sizes.
Maybe I misunderstood the difference between rake angle and VTA. I thought they were the same. It looks like your saying rake angle is the same as azimuth. If thats the case I am wrong.
Follow Ups:
Stylus Rake Angle is the front-to-back tilt of the stylus' footprint on the groove wall. Azimuth is the lateral of side-to-side tilt of the stylus. They both involve tilting the stylus in the groove, but they are in different directions--90-degrees apart. However, a circular footprint on the groove wall has no direction so the front-to-back tilt of the stylus makes no difference whatsoever.
Well then I don't understand your point. If you adjust VTA your also adjusting rake. They are one and the same. Am I missing something????
A circular footprint on the groove wall has no rake angle. Only a vertical line footprint on the groove wall has a rake angle. I don't know any other way to explain it; sorry!
I guess I see theres a difference between rake angle and VTA. But arent you splitting hairs here? To the avereage person trying to get thier cartridge sounding good, it's all the same. You gota move the back of the arm up and down right? So even a conical stylus can benifit from moving the arm up and down. Correct? Please don't confuse everyone. I mean to make a big point that VTA will make a diff but rake angle won't is just confusing the issue.
Please read:
Thanks for the link. I get the difference between VTA and SRA and will not make that mistake again. What the link doesn't mention as far as I can tell is what channges in sound you would get from adjust ing VTA or SRA. How does changing VTA effecting the sound vs SRA is what I would like to know? It would make sense that the part of the cartridge that is touching the record would have the most influece over the sound. So yes there is a difference in VTA and SRA but which one are we tweeking? And does it make a difference to what the original poster was talking about? I'll have to reread his post. Good link though. Thanks
SirAnthony,Rake angle applies when the contact area is taller than wide, and therefore represents a sort of line on the wall. The contact area runs up and down each 45 degree wall, but will appear almost vertical when viewed from the side. The deviation from vertical is the rake angle. Records must be cut with the stylus at an angle, so the SRA is usually around 18-22 degrees.
As per IEC98-1987(11.3.3 Stylus Rake for non-spherical tips):The stylus rake in the direction of groove travel shall lie between +4 and -8degrees when playing at the tracking force recommended by the manufacturer. (Ideally -2 degrees.)
No, SRA is between 3-degrees and 6-degrees from vertical. It is raked back so as to eject the lacquer cuttings during the recording process.
Ah, then I'll look into this further. There's so much conflicting information out there.
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