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Hi there! I just came back to this forum but today it's all about a cassette walkman. So recently i picked up a "like new, serviced well" EX-615 which was in good cosmetic shape but technical, it had some issues the seller wasn't telling me... I was able to fix most issues but there's still a slightly noticeable wow and flutter and i wonder what would be normal for such a machine? It surely isn't the best one ever made but with a DC servo, I'd expect it to be pretty good. I lubricated the capstan, replaced the belt and the pinch rollers with parts from "fixyouraudio" . I made myself a test tape on my Denon DRM-800 using a TDK SA cassette and used a utility on my pc to measure it. While it was much worse at the beginning, it sits now between 0.39% Rms and 0.50% Rms with peaks up to 0.60% Another unit i just picked up aswell has approx 0.20% to 0.30% Rms. Ofc. we'll also have to encounter the wow and flutter caused by the recording itself but i think this is a dramatic difference for two identical devices. One that has been "serviced" and one that hasn't been touched before (that works better). I found a spec sheet somewhere online (no official sony page) that said "less than 0,45% Rms " So while the second unit seems to be well within it's (official?) specs, the second one seems to be a little off. So i wonder if this is as expected and "as good as it gets" or if something else might be wrong with it? Both units got brand new rubber parts and lubrication where it is needed and accessible without removing the pcb. Btw. the wow and flutter of my denon deck is just about 0.06% RMS on average, with peaks up to 0,1% RMS from now and then, playing the test recording i made with the very same machine! What are your thoughts on this? I'll definitely never buy from this seller again 😄