BJT transistor circuit description of a quality amp circuit diagram pcb’s drawings. Prepared persons (author unknown a circuit in the archive) thanks the following descriptions are his own. Drive transistors. BC548C instead of 2SC3198 (BC237), instead of 2SA1266 BC558C... Electronics Projects, Stereo 100W Amplifier Circuit PAS4100 Prologic Shikhman "audio amplifier circuits, transistor amplifier, " Date 2019/08/02