The best tubes that I tried when I had my 20A were the Special CJ Test version of the Mullard CV4003 from Upscale Audio, (recommended by Kevin Deal from Upscale). They were "magical". Don't know why, but they did sound better than anything I tried.
I also used BDR cones underneath and either a VPI brick on top or a Brightstar Audio Little Rock on top.
BTW, the 20A was one of my favorite preamps. It's very musical and smooth and open...I really miss her...
I also used BDR cones underneath and either a VPI brick on top or a Brightstar Audio Little Rock on top.
BTW, the 20A was one of my favorite preamps. It's very musical and smooth and open...I really miss her...