Carr Slant 6V has 4 6v6s, 2 cathode biased, 2 fixed biased, you can use either pair or all 4 for 18, 22 or 40 (very loud) watts. 2 channels completely independent, great amps (have 4 various ages and configurations) along with PRS, Two Rock, Marshall, Rivera (Venus 6 another 4x 6v6 amp but it...