Regardless of the terminology the manufacturer's literature may use, both amplifiers are active. An active device in the context of amplifiers is a tube or transistor. It is the opposite of a passive device, which can refer to a resistor, capacitor, inductor, transformer, switch, etc.
The buffer amplifier has, presumeably, a gain of one, or very close to it. The amplifier with four 6922's presumably has a gain considerably greater than one.
The two-tube amplifier "needs a little more crank of volume" than the four-tube amplifier simply because it has less gain. It's hard to generalize beyond that.
Regards,
-- Al
The buffer amplifier has, presumeably, a gain of one, or very close to it. The amplifier with four 6922's presumably has a gain considerably greater than one.
The two-tube amplifier "needs a little more crank of volume" than the four-tube amplifier simply because it has less gain. It's hard to generalize beyond that.
Regards,
-- Al