12 hours a day will cost about $85 a year. You might check with AR for replacement set of tubes every few years.
Anyone ever measure audio research Ref 6 Power usage?
Have a chance to get a used audio research preamp and have Learned it has lots of tubes. How many watts are used when in use? Plan to keep it on a lot
Is this a good preamp compared to other things?
I wouldn't mind spending 15 to 20,000 Thousand for a very nice line stage preamp with tubes?