How often do you send your tube pream/amp to the manufacturer for service and calibration?

I purchased an ARC D-115 MKII amp in ‘87. I had it for 20 years before I sent it to ARC to get re-capped. It was good until 2020 when it started blowing the line fuse over and over again. Unfortunately this also was the start of the pandemic.

ARC couldn’t repair it so I gave it to a local hifi dealer to repair. They had it for a year and didn’t make much progress.

I upgraded in 2021 to a REF 75SE and was back in business. Finally I had music again. All in all, 30 years on the D-115 is pretty good. I loved that amp and still have it. One day I’ll send it back to ARC for repair

Re-capping every twenty years is not a bad idea, I suppose. My amp is probably twenty years old, I bought it used recently, and I doubt that anything was ever done to it, though I don't know.

@larryi 

Same for me, only thing I ever sent back was a CD player... transport mechanism... the only unreliable part.