> Ah, good ol' 5965s. > > These were a higher-spec version of ... some really common tube which I > no longer remember. The Bendix G-15 was wholly based on them. 5965 is a computer rated 12AV7 with better balanced cutoff characteristics, but generally worse for noise. About 15 percent of the tubes in a G15 are 6197s, which are computer rated 6CL6s. -- Will