The one piece of gear you will never sell

I dream of one day having THE system where nothing needs replacing, but I suspect that really IS a dream. That said, I own a SMcAudio VRE-1 preamp that I consider the finest piece of equipment in my rig, and certainly the preamp I will likely keep for the rest of my days. I've some gear that I have owned longer (a Naim Nait II still sees some use but I am neither wed to it or motivated to sell it, which is not the same as wanting to keep it forever). The VRE-1 though, is just special and I long to feel the same way about other components in my rig. 

I think you might find that your ZeroStat will cease to emit ions. I have an old white one that is no longer effective.

My Vendetta phono stage will never leave my system - ever!

I'd be unlikely to divest myself of any of my three Classe DR3 VHC either.

Without a doubt my Sansui AU-111! I have owned and collected audio gear for years now and have owned Scott, marantz, other sansui amplifiers, conrad johnson, rogue audio, and many other audio gear, which I admired each in their own way, but if I had to narrow my collection to only one amplifier, it would be the Sansui AU-111. Nothing I have ever owned ever bested this amplifer, vintage or new. And for this reason, I will never part with it!

My first little stereo out of high school was a Scott 299-B that I now have another one of and hope never to part with. I have owned so much vintage gear it made my head spin, and I am sad to see it now worth so much that the hobby is no fun anymore for me. After so many other Scotts etc etc, the 299-B has such a sweet, nice sound with the right speakers and is the only way to listen to old Beach Boys LPs