analogaudio wrote:To answer your question: it is not necessary to know the spring tension because Technics already figured that out when the unit was designed and manufactured.
It is necessary to verify that there is no damage to the spring or the mechanism. Then assemble the "canceller" spring correctly and the job is done.
I have doubt that the spring has sufficient tension. The prior owner of the turntable in question was a “DJ”/rapper who beat the crap out of it. It’s a SL-1700mk2, which is extremely rare to find, regardless of condition. Now, I’m left to put this turntable back into operating condition, which hasn’t been easy. As I said, I am doubtful that the spring was unharmed... I’m sure that Technics did a fine job of designing the spring, but they certainly didn’t anticipate the abuse this poor thing endured. One of the best things about the SL-1700mk2 is that it has all of the best attributes and parts of the much-loved SL-1200mk2, but adds a better chassis / plinth suspension to cut out communicated vibrations, and has an auto-return function on the tonearm at the end of play, that creates zero effects on the stylus tracking. So, this particular turntable is very worthy of being rehabilitated.