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Win, where have you been the past 5 years? :-)

Posted by Garth (A) on September 17, 2006 at 09:00:11

In Reply to: Re: What do you mean "back the cartridge up a tiny bit" ? posted by mosin on September 17, 2006 at 08:35:46:

And I think you mean 219mm. Newbies pick up on wrong data real easily. :-)

In any case that was hashed out here long before the VE even existed I believe.

It all came about with the popularity of the Wally Tractor. Because he had to assume a pivot to spindle distance of 222mm with a Rega arm he choose the effective length according to Baerwald that correspsonds with that distance. But he didn't realize the Rega arm was not designed with Baerwald geometry in mind.

Unfortunately it (Baerwald null points) places the cartridge at the very far end of the headshell slots to meet the requirements of the effective length, IE pivot to spindle distance plus overhang.

I pointed this out to Wally in 1998 in person when we could not align a Transfiguration Spirit on a Rega arm mounted on a Basis TT using one of his first WT. He thought the arm was not properly mounted. It was, at 222mm as specified by Rega. This particualr cartridge has a shorter than normal stylus to mounting hole center distance but is not the only cartridge that does not work.

So that's the story why if you move the arm to 219-220mm you have more "play room" for adjusting the overhang when using the Baerwald null points.

The problem is not the Rega arm of the mounting dimensions from Rega it is the concept of aligning the cartridge "on that arm" using the Baerwald null points. It gets even worse with Loefgren.

But the above person is using a Stevenson protractor which is "very" close to the null points the Rega arms were "probably" designed around. Rega does not reveal any info other than mounting distance. However if one solves the equation to determine eff length based on mounting distance and null points and assumes 222mm and the null points of 60.5 and 117mm The resulting effective length of 237mm is what it actually is if measured. Hence comes also the assumption the overhang is 15mm, IE 222 + 15 = 237mm effective length.

What doesn't make sense above is the fact he is using the "correct" protractor and has one cartridge that doesn't "fit" whereas others do.

Probably operatoritis. :-)

Cheers!

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