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In Reply to: RE: Forgive me if this is a dumb question, but... posted by Mr Blue Sky on July 05, 2012 at 18:15:09
You could try this.
Doug
Follow Ups:
What are you suggesting here? The unique mounting plate? Please explain. Thanks! Also, how is the arm? How does it sound/track? I've not heard mine yet.
Mr. Blue Sky,
I wanted to get my 120 working and mounted with my L34 Rondine Jr., but like you found, alignment is difficult so I built the sliding base to set overhang - the distance from the spindle to the stylus point. That worked, but I couldn't quite get the right angle for the Baerwald alignment so I made an adapter which allows the cartridge to be rotated in the head shell. The alignment is a bit fussy, but it works. The key is a machine screw which drops through a fitting in the hole at the top of the head shell to a flat aluminum bar which carries the cartridge.
I like the look and simplicity of the 120. It's built like other Rek-O-Kut products - no frills, no foolin' around - and I'm very pleased with the way the table and arm sound. The arm tracks very well.
Tom - Thanks. The solution was born of desperation.
Doug
Hi, Doug,
You came up with a great solution without having to modify the original tonearm and headshell. As you discovered, trying to force a square alignment into a round geometry can be frustrating. (Pardon the lousy pun.) The photos are especially helpful.Mr. Blue Sky - The slotted mounting plate acts like a sliding base similar to what SME uses for their tonearms. Instead of moving the cartridge forward or backward to get the stylus at the proper position you slide the whole tonearm. But the similarities to the SME tonearms ends there...
Modern SME tonearms are designed for the Lofgren A (Baerwald) alignment and you slide the tonearm to put the stylus at the proper null point position(s). The headshell is fixed because you don't need to slide or rotate the cartridge. The stylus will be at the right angle when it's at the right position.
But the S-120 tonearm is designed for a different alignment than the Lofgren A alignment. The tonearm has a different geometry (tonearm position/length and headshell angle). Just sliding the tonearm to put the cartridge at the Lofgren A null points gets you only part way there. You still need to rotate the cartridge to have the right geometry to fit the Lofgren A alignment. That's where the headshell adapter plate comes in; it allows you to rotate the cartridge to get the right stylus angle. You'll then have the correct combination of tonearm position/length and cartridge angle. (The headshell angle is still wrong but you compensate by rotating the cartridge.)
As Doug mentions, it's not going to be as easy as just sliding the tonearm like an SME. Once you find the right tonearm position (by sliding it) to put the stylus at the proper null points you'll need to rotate the cartridge to find the right stylus angle. But it shouldn't be any more difficult than trying to set up a cartridge in a slotted headshell, where you have to find both the correct position and angle simultaneously.
Enjoy the project!
Regards,
Tom
Edits: 07/07/12 07/07/12
Great idea!
Tom
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