Who makes the amp? Do you have to bias your tubes or self bias?
Power tubes in a Mac and VTL 2-5000 hours on power tubes.
Signal valves depends on the duty and what it’s being used for, sometimes only half the valve is being used, but you still need good valves to begin with. Same 2-5000 hours.
I’ve lost power and signal tubes..Sometimes problems with one can adversely effect the other.. One can take out the other..
You say 6550? Not KT88s, they are a little different.. US vs UK ay?
I like TungSol 6550s most others are a shot in the dark..EXPENSIVE
300-1000 a set, for well matched quads.
Regards
Power tubes in a Mac and VTL 2-5000 hours on power tubes.
Signal valves depends on the duty and what it’s being used for, sometimes only half the valve is being used, but you still need good valves to begin with. Same 2-5000 hours.
I’ve lost power and signal tubes..Sometimes problems with one can adversely effect the other.. One can take out the other..
You say 6550? Not KT88s, they are a little different.. US vs UK ay?
I like TungSol 6550s most others are a shot in the dark..EXPENSIVE
300-1000 a set, for well matched quads.
Regards