Wes Montgomery

According to Jazzguitar.be, Wes Montgomery never really found the amp that sounded the way he wanted it to. In his later years Wes Montgomery played this Standel amp : the Super Custom XV has 2 channels, a normal one and a reverb/vibrato one. The amplifier has 70 watts RMS and a JBL speaker.

On this 1965 show, you can see the panel of his amp including the Sandel logo on the left side and the right number of pots : 3 on the left and 2 on the right. Since the video is more than a hour long, go directly at 39:40. Moreover, on the official website of Standel, a short page is dedicated to Wes : http://www.standelamps.com/about_us/story/story_p10.html

from Music Radar:

"Contrary to popular belief, he was constantly looking for ways to brighten the sound. His strings were, in the words of Russell Malone, "cables!" - 0.014 to 0.058. His choice of amp fluctuated between Fender Super Reverbs and Twins, before he switched to a Standel Super Custom in the mid 60s."

from Music Radar:

"Contrary to popular belief, he was constantly looking for ways to brighten the sound. His strings were, in the words of Russell Malone, "cables!" - 0.014 to 0.058. His choice of amp fluctuated between Fender Super Reverbs and Twins, before he switched to a Standel Super Custom in the mid 60s."

There is a photo of Wes during a recording session in which an Ampeg Gemini mic'd up.