A pair of Q1 & Q2 transisitor drivers are the main transistor amplifier, while the other three pairs of transistors that form the current dumping circuit mode so it will work if there is a signal (especially bass). Final installation of this transistor is in the Blazer, hercules, Eti300w / new Giant. The design of this kind are designed to produce a stomping bass tones, the clarity about the number two, but here the driver transistor is working at grade A. The heat generated quite a bit because of using this mode (current dumping) plus the number of final / power transistor which is more than one pair. I used to use a minimal amount of the final two pairs of transistors to avoid this summer.
Installation of the load resistor should still be there at the foot of the emitter. R16 and C4 are usually intended to stabilize (reduce) the frequency of ultra treble. All use of Sanken transistors. Supply 63V 800VA toroid ct. Reservois capacitors used for stereo 2x 10.000uF/100V Estimated power ... 500W rms at 8 ohms and 1000W at 4 ohms, but supply is limited in the 800VA transformer. Confused with a power output of this? Do not worry about who is more important than that is the loud speaker and the supply has not decreased. With the supply of the transformer between them are quite satisfied to control the speaker says 18 ". If I may be wrong image, R4-220K-C2 in parallel with 68pF