Free cartridge upgrade...... it works plus Jelco 750 alignment info

[Stratmangler]

What set up geometry did you use with your Jelco Marco?

I guess my 250 would use the same geometry..

Marco has been using SPUs for ages - he just connects the headshell to the end of the arm and pootles about a bit with the VTA and VTF.
Ortofon seem to prefer Baerwald geometry

[Marco]

Hi Ali,

The ebony armboard that Speedy Steve produced for me was drilled to suit my Ortofon arm, using the protractor supplied with it, which outlined the correct pivot-to-spindle distance, and that in turn facilitates correct cartridge alignment (for my SPU), using Stevenson geometry.

The Ortofon, Jelco, stock Technics SL-1200 arm, and every other Japanese tonearm I've used, all perform optimally with Stevenson. The DL-103 is also optimised that way. If you haven't got your Jelco currently set-up for Stevenson, try it, and you should be in for a nice upgrade!

Marco.

[Spectral Morn]

Tried this once and it doesn't work for me... Please remember that this is from the man who bodges up Rega arms, adding loads of midrange resonance to add 'excitement' to an otherwise pretty inert structure, adds other bits of sometimes dubious finish and then sells at a good markup.... in my opinion of course!

What an appalling and inaccurate thing to say......

[Ali Tait]

Hi Ali,

The ebony armboard that Speedy Steve produced for me was drilled to suit my Ortofon arm, using the protractor supplied with it, which outlined the correct pivot-to-spindle distance, and that in turn facilitates correct cartridge alignment (for my SPU), using Stevenson geometry.

The Ortofon, Jelco, stock Technics SL-1200 arm, and every other Japanese tonearm I've used, all perform optimally with Stevenson. The DL-103 is also optimised that way. If you haven't got your Jelco currently set-up for Stevenson, try it, and you should be in for a nice upgrade!

Marco.

Cheers dude, I'll give it a try. Have it set up with Baerwald at the mo.

[Ali Tait]

Marco has been using SPUs for ages - he just connects the headshell to the end of the arm and pootles about a bit with the VTA and VTF.
Ortofon seem to prefer Baerwald geometry

Aye, but I know he used a Jelco for quite a while, and it seems to be quite difficult to find what the correct geometry is for an arm.

[vinylspinner]

Hi Ali,

Dom and myself set your arm for Baerwald, that is what I use at home, it sounds the best to me, if you recall Owston in November, both our protractors came up the same, which was Baerwald.

Nigel

[Marco]

There are so many variables with this kind of thing (mainly at which point on the record you wish to minimise distortion), that it's best not to get too anal about it, and simply try out the various geometry options, and go with what sounds best, to your ears, in your system

However, if you do some proper research, you'll find that Stevenson is the recognised 'optimal' geometry for all Japanese 'S' or 'J'-shaped detachable-headshell tonearms. Even the little plastic overhang/alignment tool (which is surprisingly accurate), and supplied with all new Technics SL-1200/1210 T/Ts, is set up for Stevenson:






Trust me, the manufacturer wouldn't have done that for nothing!

Marco.

[NRG]

The standard 750D parameters from Jelco suggest a Stevenson alignment. However, the best alignment for the Acos Arm on my PL-71 appears to be Baerwald, well it seems to work well!

Edit: Confusing the different alignments up!

[Marco]

Incidentally, returning to the original thread topic, I suspect that this could be a more elegant (if not also more expensive) solution:

http://www.cabezon.eu/product_info.php?products_id=265

Worth trying, I think, and not just for those with DL-103s

Marco.

[Ali Tait]

Hi Ali,

Dom and myself set your arm for Baerwald, that is what I use at home, it sounds the best to me, if you recall Owston in November, both our protractors came up the same, which was Baerwald.

Nigel

Aye, I remember, that's what I have it set with at the moment. I'll give Stevenson a go when I get time.