The original Max 115 has a natural roll-off below 60Hz to protect the speaker. By tracing the preamp’s coupling capacitors on the schematic, you can increase the value of C5 (usually 100nF) to 470nF or 1µF. This extends the low-end response at the risk of exceeding speaker excursion—use with caution.
The is not a disposable amplifier. With its 15” Sheffield speaker, sturdy particle-board cab, and simple electronics, it deserves to be repaired, not recycled. But without a clear, exclusive, and annotated schematic, even an experienced tech wastes hours tracing incorrect paths. peavey max 115 schematic exclusive
While not on the PCB schematic, the Max 115 is often associated with the Black Widow speaker. The original Max 115 has a natural roll-off