Hello. Thanks to excellent Stephe's teachings I have modified my R8 (all Skunkie mods, KT88 as triodes, without GNFB).
I am still chasing a rabbit. My last idea was to replace 6SN7 with Bendix 6385 on adapters. 6385/2C51/5670/WE396a on paper has max plate voltage 300v, max plate dissipation 1.5W per plate, max plate current 25mA so I guess should work as a 6SN7 replacement. Am I right? Any help will be appreciated.