From SoundStage! review of C/J Act 2
"Conrad-Johnsons adoption of the 6N30P for use in the ACT2 appears to signal the company's long-term acceptance of this tube as a replacement for the 6922. The 6N30P is a high-current/low-voltage device whose very low plate resistance requires no cathode follower. It makes for a nearly ideal preamp tube. Whereas the ART used five 6922s per channel (ten triode sections in composite), the ACT2 only needs two 6N30Ps (four sections) per channel to yield its 20.5dB of gain. Indeed, Lew Johnson commented to me, "The 6N30P has some unique advantages -- mainly exceptionally high transconductance, allowing it to substitute for three to four of the 6922s. However, it has commensurately high current demands on main B+ and heater supplies, so costs are roughly comparable to a unit using three to four 6922s for each 6N30P."
"Conrad-Johnsons adoption of the 6N30P for use in the ACT2 appears to signal the company's long-term acceptance of this tube as a replacement for the 6922. The 6N30P is a high-current/low-voltage device whose very low plate resistance requires no cathode follower. It makes for a nearly ideal preamp tube. Whereas the ART used five 6922s per channel (ten triode sections in composite), the ACT2 only needs two 6N30Ps (four sections) per channel to yield its 20.5dB of gain. Indeed, Lew Johnson commented to me, "The 6N30P has some unique advantages -- mainly exceptionally high transconductance, allowing it to substitute for three to four of the 6922s. However, it has commensurately high current demands on main B+ and heater supplies, so costs are roughly comparable to a unit using three to four 6922s for each 6N30P."