I had the occasion to mount an Ikeda IT407
(the 12" actual Ikeda arm), just for "trying", 'cause it's not mine
, on my SL1100. Well, no exactly "on" but on it's side, in an MDF structure filled with concreat, specialy done for this purpose.
Great experience : the best musicality I've heard with my poor TT system (an AT440 cart). Very easy to mount and to set - is another impression I still have few days after (even if I had to mount aditional weight in the headshel 'cause the At440ML is not enough heavy for this arm).
But one big problem : to much noise, like hum due to grounding problem.
On the scale from 1 to 10 on my amplifier, at 4, the noise made the music not enjoyble.
The arm was grounded through its cable : 5 pin slot mounted on the arm, 2 x rca + ground spade on the phono pre-amp. The mounting informations provided by IKEDA SoundLabs didn't mention that necessary to make extra grounding of the arm, and any way, no screw on the arm's structure alow to do it. And no DIY on an IT407 that it's not mine.
This kind of noise does not exists on the SL1100 with the original arm. I have once mounted on a similar structure an SME3009 (much more difficult to mount and set) and there was no hum with it either (the ground cable included with the original SME cable, was mounted from the arm's structure to the pre's ground).
Anyone have any ideas ?