I had a Vox AC15C1 for many years and sold last year. I'm once again GASing a Vox similar amp. I could just buy another AC15C1 but have been looking further. What I'm confused about is where the EF86 fits in this family tree. Is EF86 integral to Vox sound? Current Vox amps - NO EF86 Morgan AC20 - NO EF86 Matchless C30 / C15 / Nighthawk - EF86 Matchless Lightning - NO EF86 Bad Cat Cub - EF86 One concern is regarding quality or availability of reliable EF86 tubes. I've seen more than a few posts discussing new tube being microphonic either immediately or not having a reasonable lifetime. What experience have people had?