I cannot say what it will do for the 535 but if my experience with a CJ preamp is indicator, it will be worth the $$$. Of course, you don['t want to spend too much. Nine was $200 for cleaning and checking and new top of line Nichicon caps.
The 535 was a decent amp in its day and I remember many saying it was the best sounding of the 535,545 & 555. I suspect caps and cleaning will bring it close to new.
The 535 was a decent amp in its day and I remember many saying it was the best sounding of the 535,545 & 555. I suspect caps and cleaning will bring it close to new.