Freo-1
Well-Known Member
Although I have never had the pleasure of owning a MC275 (all my Mac gear is SS), I have owned a Citation II for a number of years. Out of the current lot of available new production tubes, the Gold Lion Re-Issue would be the one I would chose. The Chinese tubes just don't last very long. If you can find them, the GE 6550A is the best viable option, but they are not cheap.