Time to retube the Bassman pro 300 thinking about doing the full spread just to try something new in the preamp section, also making the switch from 6550's to kt88's, I think I'll be going with these...
https://www.tubedepot.com/products/genalex-gold-lion-b759-ecc83-12ax7-preamp-vacuum-tube
https://www.tubedepot.com/products/genalex-gold-lion-kt88-power-vacuum-tube
https://www.tubedepot.com/products/genalex-gold-lion-b759-ecc83-12ax7-preamp-vacuum-tube
https://www.tubedepot.com/products/genalex-gold-lion-kt88-power-vacuum-tube