12x7s should last you 5000 hours, approximately.
It pays to get them tested.
You could try some tube rolling though...
It pays to get them tested.
You could try some tube rolling though...
McIntosh C 220 Pre amp tubes...
Wondering when I should replace my C 220 pre tubes. They have roughly 1000 or better hours on them. Has anyone replaced them before in theirs, and are they easy to do under the Mac hood? Any brand recommendations for 12AX7a replacement tubes for it? Don't know what brands are good, and open to suggestions/ideas. How long do preamp tubes last on average?
Thanks in advance for any input!
Thanks in advance for any input!