What makes a good tonearm?

Dear friend: You can't say " I want to buy a tonearm ". When you want to buy a tonearm, you always have to think about it " wife's ": the phono cartridge. You can't separate, tonearm/cartridge is a "combo buy ". Go with you audio dealer and talk about this issue.
Regards.
Raul.

If you're low on cash and have moderately skilled hands, buy a used (meaning cheap and old) Rega Planar 3, and rebuild it; plus, do all the tweeks, thereby turning it to the equivalent of the "Sota Saphire". You also get the tone arm with the TT, which can be upgraded with new wire.

All the instructions for doing this are on this forum.

Check out the Audiomods arm. Made in the UK by a master machinist, who uses only the Rega 303 arm tube, all other parts made by himself. A very interesting set of design choices.

Another thread from 2004 is up now. C'mon, the price for Audiomods tonearm is higher than some absolute favorite vintage arms like Technics EPA-100, Victor UA-7045, Lustre GST-801, Sony PUA-7, Luxman TA-1 and many others including the brand new Schick "12, Jelco etc. 

The new arms are not designed for high compliance cartridges and this is the problem. What make a good tonearm goog is the synergy with your particular cartridge. 

Some of the old tonearms are underrated lon the used market, like the Victor UA-7045 - this is absolutely the best buy for those who would like to save money without loss in performance level. Amazing tonearm (imo).  

I get great results with Jelco SA-750 (9" and 12"). They run Decca/London cartridges beautifully. If they can do that, they can handle anything! (except high compliance cartridges)