Historical note, going back to Nandric's post of 04-25-2016 7:10am, regarding the FR1-Mk3 "F" compared to a plain F-less Mk3.
I have a review from circa 1980, possibly in HFN, stating that the FR1-Mk3 had a nasty treble peak, which Fidelity Research promptly fixed — and added "F" to mean "flat". According to the review, the peak was eliminated by adding a tiny tantalum cap inside the cartridge body.
I've seen photos of a nude Mk3F and couldn't see a cap added to the normal workings, even a tiny one, and there's not much room in there.
I have three of the Mk3F cartridges, all NOS, and I find they lack the last bit of transparency of my preferred MCs. That may be because they're NOS and have not "broken in"... or whatever a 40 year-old suspension does with adequate playing time.
I have a review from circa 1980, possibly in HFN, stating that the FR1-Mk3 had a nasty treble peak, which Fidelity Research promptly fixed — and added "F" to mean "flat". According to the review, the peak was eliminated by adding a tiny tantalum cap inside the cartridge body.
I've seen photos of a nude Mk3F and couldn't see a cap added to the normal workings, even a tiny one, and there's not much room in there.
I have three of the Mk3F cartridges, all NOS, and I find they lack the last bit of transparency of my preferred MCs. That may be because they're NOS and have not "broken in"... or whatever a 40 year-old suspension does with adequate playing time.
