I'm getting ready to start my monster amps, and I'm a bit torn. Ultimately, the KT-88 is the natural choice as a six pack into my 1.5K primary output transformers, but it looks like a quad of 120s would do just as well.
The concern I have is the production life of these tubes. I want to build an amp for personal, long term use. Does anyone think the production life will end soon for this big guy?