The recommended range is 250-275. Why would you consider anything else? Whenever there is a range I always use the higher setting because it sounds better.
Advice on bias range setting
In the CAD-280SA (V12R with EL34s) manual, Cary states that the bias has a minimum of 220mA and a recommended range of 250-275mA. I have it currently set to 250mA. But before making any changes I was hoping for some advice from the experienced....Why is there a range and not a fixed bias value? Will it sound different at the extremes (220 & 275)? Does this effect tube life? Power consumption? It can't get any hotter can it?