For me that's easy:

Quad 57 ESL speakers
I have been using them for the last 50 years, and despite their limitations, I'm unlikely to change them now.

Thorens 124/II turntable
Again I have used this turntable for over 50 years, and think so well of the design I bought two more (to use with different arms and cartridges).

The Decca Mk. VI cartridge
Also known as the Decca Gold, in general I prefer this model over the Decca V (also known as the Decca Blue). However I have to add this caveat: you have to find a good sample: Decca's quality control was atrocious, but with a good sample a Decca will present a sound that has a greater sense of life, attack and vivacity than virtually any other cartridge available today. Decca cartridges fitted with a fine line stylus profile are preferred, such as the rare Weintz parabolic or the Van Den Hul.



There are of course many other classic pieces of gear that
I use, but you asked to name three.