Why the sudden popularity of 12 inch arms

Raul, while everybody appreciates your enthusiasm, it sure does seem to be difficult to get you to benefit from more knowledgeable members. You posted that only the manufacturers could answer the OP. I suggest you do call or write to Tri Mai. Mr. Triplanar, as I'm sure you know. This gentleman is perhaps one of the nicest, most affable, most knowledgeable folks I know in the business. He could most certainly explain the differences that have lead to dramatic improvements to a tonearm you claim is no better now than 20 years ago. Will you believe him? Next, I suggest a phone call to Mr. George Merrill. I'm sure that name rings a bell? He would be happy to talk to you. There may not be another person on the planet who is more qualified to help you get the most from your vintage equipment. He can also explain why, and which components have come the farthest in the last thirty years. The average age of most of your system. I look forward to hearing from you after the conversations! Z.

I don't want to give the "suspicious" poster the impression that I am downplaying the "top" stuff of today.Also,I basically can't state that the superb retro set-ups I've heard are comparable,in all "meaningful" areas to such componentry.
What I am saying(from being lucky enough to hear a ton of differing system approaches)is that we(myself included)can easily get caught up in the "gadgetry race".Sometimes over-thinking/analyzing the mechanical aspects of "our" hobby can be a detriment(not always),and this can easily become an expensive game of musical chairs.
I assume(hopefully)that the majority of us got into the hobby for the love of the "music" firstly!I did.
Once one gets into this hobby,deeply,it is very easy to get too into the "gizmotic"(made that word up)aspects of why our stuff sounds so good.We like the reinforcement of industry folks,like good reviews,and good word of mouth to make us feel better about what we have invested in.Also,it is very cool to get good feedback from other owners,and see posts of how they,like us,love some familiar products.
There is a large contingent of music lovers/lp collectors that think that the equipment aspect of the hobby is there ONLY to serve the music.No big stretch there,and almost everyone feels similarly....BUT,these guys(many of which I've met over the years at The Princeton Record Exchange)"really get off" only on the music.The equipment is "nice" to them,but to hear them "go off" on a particular LP "find",and the performance held within the grooves,really has made me feel "sort-of" too materialistic.Liking the "hard work" I've put in, and sonic attributes of my mechanical devices,used to play "music",maybe a bit too much!

I am not eloquent enough to put across the point I am trying to make!

I think that if you have spent alot of time "collecting" and putting together a GREAT music collection(dwarfing the legitimate viability of the materialistic aspect of the hobby)it is far easier to become enraptured with the way music affects us.
There REALLY IS A TON of "not the latest",but "SO" enjoyable systems out there,that it is not hard to become adjusted to different sonic approaches taken by some, in this hobby!
It's nice to "let up" a little on our inner "critical listener",sometimes....When things sound "right"!!
Some time ago,while collecting at Princeton,I ran into this exchange student,from Korea.WHAT A LOVELY GUY!!!
A real music lover/lp collector.He got SO enthusiastic about the hobby(he liked equipment too,but could not afford the latest)during our discussion,that he asked me if I wanted to give a listen to some of his LP "finds" that he had made,during the ONE semester he would be in this country.He was like a little kid,showing me his new toys.Such enjoyable enthusiasm.Instant commradery!
So,I decided it would be worth while to get another "take" on how someone else,from another culture approached the hobby,while in my community.He loved RCA,Mercury,Decca classical stuff,like me.
I was bowled over by this simple setup!!!Not a large room.Not very pricey stuff.Just "truly" wonderfully reproduced "music".He surely knew what he was doing!!
I had a great time...The fellow lost hid grant,soon afterwards and went back to Korea,but I know a LOAD of good LP's went with him!I've not heard from him since,but always show my wife,and daughter the little yellow house he lived in,when we pass by.
Good equipment could be had,quite easily.Getting those priceless LP's would be alot harder!
Sorry for my rant!

Dear speedy, I have been collecting lps for about 30 years. At last count I had over 6000. I quit counting some time ago... I still have the turntable I bought before I bought my first lp. It would be my pleasure to point you to the shelves and say "pick which ever you want" and we will play them. First, on my 30-some year old turntable, that looks and performs better than new, and was "state of the art" 30-some years ago. Then we will play it on something quite new, though SEVERAL rungs down from SOTA. You can tell me/us which one made the music more enjoyable for you. I think I know the answer, and if I'm wrong, you can HAVE the new turntable! How's that?

Zieman,I don't disagree with you at all!!I love SOTA stuff....AND,I hear the difference,like you claim you do!!Surprisingly(maybe to some,like you)I believe that what I have put together in my own dedicated two channel room is close enough to not have to worry about the nuts and bolts for at least "three months"!OK?
BTW,my best audio buddies have non to shabby stuff,ranging from BIG Pipe Dreams,Magico Minis,Big Infinity four tower speakers,CJ ART,etc....I hear the difference,and our little get-togethers OFTEN spill blood,from frequent critical observations......I've made the investment myself,but we STILL split hairs too much.....TOO OFTEN!!....I say,don't stop...but...take a step back,"sometimes"!Well,maybe not you!!OK?
I guess you did not like my Andy Rooney routine-:)
Sorry.

Dear, And I do mean Dear Sirspeedy, I have been in agreement with you all the way through this thread. I too am in it for the music. I offered an answer to the OP early on, and a member with almost no logic or science to support it, offered advice that if followed, would make us all look bad. I responded again, and started getting tons of mail from members (that I had never had contact with!) cheering me on. This gentleman has a system that sounds like, well, Halcro put it best, "second rate". I can almost give the guy credit for being so stubborn, but he is so far off base... In a contest between this fellow and the world (which it seems to be) I'm bettin' on the world. Know what I mean? Anyway, if my house was on fire, I'd get as many LPs as I could FIRST, and leave the gear. Most of which is, arguably, SOTA. BTW, that was a 15,000 dollar turntable you just let get away! You can still come over, any time. Z.