Technics SL-1700 feet

Sorry but precisely because rare but above all very expensive (2 or 3 times more than the Technics 1700) it is absolutely useless to advise them.

AT616 can be used not only under turntables, but under a table platform itself, because those feet (like no others) can support up to 60kg (130lbs) and fully adjustable. Raul has been using them under subwoofers! So you can imagine. Expensive, but very effective device for proper isolation of any component in audio system. I have no idea about OP’s budget, the fact that he’s got a relatively cheap turntables is not a target price. Any turntable (from 10kg to 60kg) at any price will benefit on AT616 Pneumatic feet, so it doesn’t matter. Look at the prices for Stillpoints for example.

Isonoe are much cheaper and designed for Technics

Isonoe are not designed for any Technics model, only the SL-1200mk2, which is vastly different and inferior to the spring suspended SL-1700 and SL-1700mk2. 

I am using Isonoe, what are you trying to say, have you ever tried/seen them? They can be screwed in any technics as the direct replacement of the stock feet (which is a junk even on SH-10B3 obsidian plinth). For any other equipment (CD players etc) isonoe designed slightly different feet. Everything explained on their site. 

As a dirt cheap alternative every   machinery shop can custom made a metal cones of any size to put under turntable plinth. 

Also i think original technics parts available online for purists, but technics feet are junk even those designed for top models of their expensive plinth (even for SH-10B7) and 100% junk on SL1700 (and mk2 too) just like on any other technics OLD turntable. 

@chakster

(Technics feet are)

100% junk on SL1700 (and mk2 too) just like on any other technics OLD turntable.

Not a very objective statement. There’s more to the story also. The feet are are designed to work as part of a system. It is the whole system that either accomplishes or fails to accomplish the goal of isolation. This comes with varying degrees of success. The SL-1200mk2 for example is for most intents and purposes, unsuccessful at isolating vibration due to its poor secondary and lack of tertiary isolation (sprung rubber feet and rubber chassis) which lacks diversity of spring rates, compliancy and natural resonance frequencies.

The majority of lower end Technics models do much better with only sprung rubber feet and TNRC chassis, thanks to diversity in the isolation system.

Back to the upper mid range, the SL-1700/1600/1800 mk1 and mk2 variants incorporate highly successful sprung suspension and TNRC chassis on simple rubber feet. If you replace those with the better rubber/sprung feet from the SL-1200mk2, you end up with an isolation system that is so successful in its mission that you couldn’t want for more. That is because it incorporates elements with difffering spring rates, compliancy and natural resonance frequencies. Each on its own cannot be as effective at successfully isolation vibrations as the whole system.

Technics: the science of sound.