Seeing double, like that drunk paino player in Tombstone. Getting some Acoustic 150s to work on. They do about 100W and have tremolo and reverb. Two channels. Super light weight and portable “for the musician on tour.”
Preamp and reverb and tremolo is on the PCBs on the right and the middle PCB in the foreground is the input and driver stage of the output section. Output transistors are mounted on the chassis for heat sinking. They are 2N3055s in typical fashion. From the driver stage of the output section the signal is transformer coupled to the bases of the output transistors, kind of like Sunn Concert series. Since this is a single supply amp and it runs on a single +75V from the power supply, a big 1000uF/50V cap is used at the output to keep DC from the output section off from the speaker.
The Acoustic 134, 135, and 150 schematics and user manuals are all merged into one document, 36 pages, literally telling you everything. What a great manual — https://drive.google.com/file/d/0B01EXvY0__YYVnU1QVRqbktkUUk/view?usp=sharing