Who Is An Expert On Acutex Cartridges?

I worked for their biggest dealer in early 70’s ,
He bought them by the hundreds , the 320’s were very good and cost him about 30$ .
He sold almost every cart made , my personal favorite was the Empire ED9 followed closely by Pickering 4000 .
Best bang for the buck ever was Shure 91ED .

I had my 420STR re-tipped by Axel a while back with a Shibata stylus...much quieter presentation. I could not be happier!

The 320 in all its variations was/is an induced magnet type.  If memory serves me, the 400 series (including the 420) were conventional MMs.  Probably different from the 300 series in sonic character.

For sure and being IM type one of the main reason. ACUTEX M320 STR III is the best of them all in my system. I bought one 5 years ago as guided by Raul the Seeker, Dave the Messenger and Vic the Magician

For those that posted on this thread, I'm in need of information regarding the Autex M320 STR III. I'm encountering a feedback issue on my Garrard 401, with a Dynavector 501 arm. The cartridge sounds amazing until the feedback rears its ugly head. The plinth is a heavy MDF DIY on a sandbox (Brightstar Audio BigRock 2).

I'm thinking the cause might be the subwoofer that's about 10 feet away. I should have tried it without the sub, but I changed to a different cart first.

I tried Vinyl Engine, they had no info regarding compliance and arm matching on this particular cart.

I appreciate any info that can be provided.

Thanks,
Dan