Personal Preamp Evolution.

Rogue 66
BAT VK-31SE
Rogue 99 Magnum
Audible Illusions 3a
EAR 864P
Cat Ultimate v1
Hovland HP100

Yamaha Surround pre?
NAD 1600 pre/tuner
Superphon Rev II
Audio Research LS1
Audire Diffet
C-J PV10a
Musical Fidelity A3cr
C-J premier 17ls s1
Audio Research LS 17
C-J premier 17ls s2

What a sickness this hobby is.

Audible Illusion Modulus 2D
Audio Research LS2B
Audio Research LS15
Sonic Frontiers Line 3
Sonic Frontiers Line 3SE
Sonic Frontiers Line 3SE+
Einstein pre amp

Evolution implies progress, which I'm not sure is the case. Returning to some vintage roots finding some surprises. Here's the sequence (since 1968), with some overlap

McIntosh C20 (20 years)
Audible Illusions Modulus 3 (10 years)
Creek OBH-10 passive (8 years to date)
Wright WPL-10v (6 months)
Audible Illusions Modulus 3a (3 years to date)
Conrad-Johnson 17LS (1 year)
Hovland HP100 (1 yr)
Mapletree Audio Ultra4 (1 yr)
Promitheus TVP (1 yr)

Notice the trend. At this rate, I'll be trying a new one every 3 months!

Quad 33, Dayton-Wright SPA modified, Precision Fidelity C-7, Classé DR-7, BAT VK-3i, BAT VK-51SE. Then I eliminated the preamp completely buy using the preamp section in the Audio Aero Capitole and Prestige CD players.