For those willing to invest the time to understand the MAX 115's internal design—aided by the community-shared schematics and service manuals detailed in this guide—the rewards are substantial. Whether you are restoring a non-functional unit, modifying it to suit your tonal preferences, or simply maintaining it for years of reliable service, the schematic is your most valuable tool.
Access the exclusive, full-resolution Peavey MAX 115 schematic (Rev C & D), annotated component layout, and voltage checklist below.
Features a robust toroidal transformer that steps down AC voltage, which is then rectified by a heavy-duty bridge diode network and smoothed by large electrolytic filtering capacitors. This rail supplies roughly DC directly to the power transistors. peavey max 115 schematic exclusive
Exclusive insight: Early versions used a single JFET input buffer; later revisions (post-2012) added a dual op-amp for lower noise. Check your board for IC1. If it’s a 4580, you have the updated low-noise spec.
The Fix: Use a digital multimeter (DMM) in diode mode to test for continuity across the emitter, base, and collector legs. Replace shorted transistors as matched pairs. For those willing to invest the time to
If you own a bass combo amp and are facing a repair—whether it’s a dead power section, noisy preamp, or blown output transistors—tracking down the correct schematic is step one. The “exclusive” schematic isn’t a secret, but getting the right version matters. Peavey revised the MAX 115 several times (e.g., original, “II,” “150,” and “USA” versions).
If your Max 115 is blowing fuses, distorting abnormally, or outputting complete silence, look at these common failure points on the schematic. Symptom: Amp Powers On, but There is Total Silence Features a robust toroidal transformer that steps down
Depending on the specific era of your Peavey Max 115, the power amplifier topology varies:
Manages the initial instrument signal, handling both active and passive bass outputs.
Here lies the biggest variation. The MAX 115 is a 150-watt RMS combo. Most schematics show two possible topologies:
Understanding how these sections interact on the printed circuit board (PCB) allows you to isolate faults quickly without tracing every single component. Circuit Stage Analysis 1. Power Supply Unit (PSU)