inna, you can bias amp’s output stage for 20% less current, and use 120<=>110V step down transformer. These two steps will increase tubes life time significantly, est. 30%+.
"Next year maybe, I spent enough already. I would be cautious to take the sound in warmer direction compared to how it is now” yeah, next year you will be one year older, and hopefully everything around you will be “warmer” LOL
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