Also the build quality of these things can't be understated. Let me share something that happened several months ago. At one point I had the fisher set up with a system I was using upstairs in my office. I had the fisher sitting on a rack in front of a window. I use to love sitting back at night in my lazy chair with the window up enjoying the cool open air breeze while enjoying the sweet sounds of the fisher.
One night I turned my fisher on and went downstairs to get a snack while it was warming up. And out of nowhere it started raining hard, and I had left the window open. My heart sunk. When I got back upstairs, the fisher was smoking and it smelled like the house was on fire. I even tripped not only the breaker in that room, but the whole house.
Once I unplugged it, all of the output tubes were shattered, and two of the input tubes were blown as well. I was devastated. I had blown my fisher!!! I was prepared to spend whatever it took to get it repaired, but I knew parts may not be easy to come by. I opened it up to see what else was damaged. I tested the rest of the 12ax7s and they were still good. I found a pair of the very rare 7868 on line that tested near nos, and pick up a pair of some nice sylvannia 12ax7s. Plugged them in and the fisher was singing again.
I took it to a local shop that I use to service all of my gear, and the guy told me that everything else was good. Not a bad resistor or cap anywhere. The output tubes were fine. The only thing the rain did was blow my tubes. If you would have seen what I saw, you would have been convinced as I was the whole thing was blown. But with a change of tubes it was back to playing the way it was previously. Well with the better tubes I bought, it actually sounds better now. These things are built to last.
