lalitk OP, everyone
I can lower all 3 arms onto an LP, it plays perfect speed (as Halcro proved)

so I can compare 2 or even 3 cartridges within seconds by my two dials on my SUT
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I make any needed volume adjustments when I change, my Cayin Amp volume knob is right there at 12 oclock normal (for more precision, for subtle differences, I make temp. A,B,C pencil marks on the amp’s aluminum face plate).
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A new friend and I just quickly compared a pair of Mono LPs and a pair of cartridges, just to let him hear the difference.
1st with my MM Stereo AT160ml Cartridge and Mode dial in Mono, beryllium cantilever with MicroLinear Stylus (VAS verified good)
2nd the MC AT33ptg/II 50th Anniversary MONO (VAS rebuilt with boron/microridge) Mode Switch in Stereo and then moved to Mono.
The Stereo Cartridge playing a very flat, excellent condition mono LP of content recorded in 1955, with mode switch in Mono sounded good, if I only had a few Mono LP’s, like the old days, that would be ’good enough’.
The Mono Cartridge (mode switch stereo or mono made no difference this time) was immediately more involving, definitely had increased clarity of individual instruments, that’s a trombone, that’s a trumpet, ..... if voices, I can say there would be an obvious improvement there too.
If you have more than a few Mono LP’s, if you have the money, definitely get a true mono cartridge. start at least with the Grado ME+ Mono Elliptical on Aluminum for only $185, it will be worth it, you will hear a preferred difference.
I have to say, I personally wouldn’t pay $1,000 or more, but the $600. I spent creating my Franken MC Mono with boron/microridge is noticeably better/preferred to the Grado Elliptical, i.e. the risk paid off!