Fully summetrical amp has the same transistors in both sides, not pnp and npn (n and p channel) together, but both are npn(n), load is connected as bridged. Not very common in transistor age, but in lamp amps it is common.
@@misterbonzoid5623 Well they are not common and have a stand alone opposite phase preamp that feeds really symmetric output with no stupid common bias, negative feedback is local like vacuum lamp amps not as here super pointless from out to in feedback. The amplifier pictured here is typical low quality amp from 1980 style. From out to in feedback has a compressed effect cutting off low bass signals a super distortion of a signal. Any amp stage must have limited amplification without feedback not as here in this pointless amplifier.
