Look at my system , it lists the QS amp that I am using. BTW, just because you had a tube failure in 3 days doesn’t mean that you should write off the EL34 tube to use with the Mid Mono amps!
Those Mono amps are discontinued. Most of the QS amps are discontinued. It looks like Mike is winding down. The pickins' are real slim if you take a gander at the QS site!