My experience with Sophia tubes in general is 150 hours is the optimal point but I will admit, I have never had an amp with the 6SN7s in it. I would trust Sue.
Can't see any reason to leave an amp on 24/7 unless you have very restricted listening windows and you need to make every minute count. Otherwise, you are just burning away money. I can't speak about Modwright but my amps take 20 minutes to warm up.
Can't see any reason to leave an amp on 24/7 unless you have very restricted listening windows and you need to make every minute count. Otherwise, you are just burning away money. I can't speak about Modwright but my amps take 20 minutes to warm up.