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Audio Research CA50 + tube rolling
I used 4 different tube sets.Favorite - Amperex 7308 white label. Caveat, the amp eats up these tubes. I went through two sets in 8 months...no more.Ediswan CV5358 - I liked these tube a lot. These tubes gave the amp some added jump. The highs are... 
Audio Research CA50 + tube rolling
I had a CA50 and the ONLY thing that I really disliked about it was the fact that the voltage needed to be changed/adjusted whenever your swapped out the driver tubes. I would call AR back and ask to speak to someone more seasoned, they will be ab...