The SOTA Sapphire turntable and Magnepan Unitrac tonearm I purchased in 1983 still work as well as the day I bought them. Given the prices of high quality turntables and tonearms these days; the hassle and risk that would be involved in sending the table in for the upgrades that are available; and my increasing gravitation toward digital sources, I have no plans to replace them in the foreseeable future.
Also, I don’t envision replacing the Stax Lambda Pro headphones I purchased in the mid-1980s. The foam in their earpads which covered the electrostatic elements started to disintegrate a few years ago, and I replaced the earpad/foam assemblies with genuine Stax originals I bought from Audiocubes.com. Some years ago I also replaced the Stax solid state headphone amplifier I had been using for many years with a 1980s tube-based Stax amplifier I purchased used, which was a very nice improvement.
Best regards,
-- Al