All time classics? Your top 3 or 4?

Linn LP12 - Most influential TT ever.
Quad ESL 57 - Most influential early ESL.
Denon DL103 MC Cartridge - most influential MC design ever.
Rega RB250 tonearm - 1st real High-end arm at low price.
Berning ZOTL amp-Made SET OTL possible for the 1st time ever
Stax Headphones - Set the world standard for many years.
ReVox B77 - Long time World standard for Open Reel Tape decks.

Honorable mention:
Futterman and Atma-Sphere for pioneering OTL design
Marantz 8B for it's amazing longevity
Koetsu for truly High-end MC cartridges

TWL rocks! My picks:

Magnepan MG-3 (other models too)
Harold Beveridge model 2+2W electrostatic speakers
Andy Rappaport amp one
Conrad Johnson Premier 1 and 3
Joseph Grado cartridges

(1)Linn LP-12
(2)Dalquist DQ-10
(3)Spectral DMC-10
(4)Snell AIII
(5)Koetsu Rosewood
(6)Bedini 25/25 1 MEG

All of the above set the standards for their time or their respective categories(IMHO).

This is a difficult.

Harmon Kardon Citation 16 (my parents had one when I was a kid, It rocked)
Magnapan MG IIa,s (1st high end speaker I owned)
NAD 3020 (one of the best values every in HiFi)
Thorens TD160 W/Grace707 arm (1st turntable I owned)

I have owned, and regretfully sold, the below mentioned classic's with the exception of the MFA MC Reference which to this day still resides in my main system.

Mark Levinson ML-2
Classe Audio DR3 VHC
MFA MC Reference
Denon DL103
VPI TNT