Octal power tube (Max Plate Watts = 25W) EL34B(with shadow grid) is a high performance improved version of pentode EL34A to solve the problem of overheated No. 2 Grid. Maximum anode dissipation is 25W and output power of single tube is over 10W in A1 amplification mode. When used in AB1 mode, two tubes can output over 35W. It can substitute 6CA7.