Schematic Exclusive - Peavey Max 115

Note: Peavey does not publicly release schematics for current in-production models to prevent reverse engineering. The "exclusive" nature of this document would imply it is either a factory service center document, a vintage archival scan, or a traced reproduction.

Title: Technical Analysis & Service Report: Peavey MAX 115 Bass Amplifier (Exclusive Schematic Review) Date: [Current Date] Subject: Peavey MAX 115 (Single 15" Combo, 300W) Document ID: PV-MAX115-SCH-EXCL-001

Exclusive Community Archives (If Peavey Takes Too Long)

Some verified schematics circulate in tech forums. Use these only if you can’t wait or have a discontinued revision:

• Elektrotanya.com – Search “Peavey MAX 115” – contains the original 1999 power amp section drawing.
• Freestompboxes.org – In the “Repair” subforum, user Mojotech posted the MAX 115 preamp schematic (with DDT).
• Music Electronics Forum – Search for “Peavey MAX 115 schematic needed” – a user named Enzo (legendary Peavey repair tech) posted the output module pinout.

⚠️ Warning: Many free “schematic” sites show a random guitar pedal or completely wrong Peavey amp (e.g., a Bandit 112). Always check for voltage rails and transistor numbers. peavey max 115 schematic exclusive

3. The Power Amplifier (The Muscle)

This is where most failures occur. The Max 115 uses a discrete component power amp, typically a quasi-complementary or full complementary symmetrical design. Expect to see:

• A differential input pair (often 2N5401 or similar)
• A voltage amplifier stage (VAS) with current source
• Driver transistors (e.g., TIP31/TIP32 or MJE340/350)
• Output transistors (e.g., 2N3773, MJ15015, or Peavey-branded transistors)

Crucially, the exclusive schematic will show the biasing network. One of the most common errors is mis-setting the idle current (quiescent current) after replacing output transistors. Without the schematic, you might set it too high (overheating) or too low (crossover distortion). The correct document specifies the voltage drop across the emitter resistors (e.g., 5mV to 10mV).

Mod 3: Preamp Out / Power Amp In

The schematic shows test points TP7 (pre out) and TP8 (pwr in). Install two ¼” jacks here to use the MAX 115 as a standalone preamp or power amp for a modeler. Note: Peavey does not publicly release schematics for

Key differences:

• Original MAX 115: Dual rail ±55V, transformer power supply, standard op-amp preamp (TL072, 4558).
• MAX 115 II / 150: Higher power, added effects loop and DDT™ compression.
• MAX 115 (post-2010): Switch-mode power supply (SMPS) and Class-D amp.

2. Source & Exclusivity

• Source: Peavey Electronics R&D Service Archive / Authorized Service Center (ASC) Portal.
• Restriction: This schematic is marked for service use only and is not included in the user manual.
• Revision: SCH-MAX115-Rev C (integrating the 2020 component change from IRF640 to IRF740 MOSFETs).

The "Black Widow" Speaker Integration

While not on the PCB schematic, the Max 115 is often associated with the Black Widow speaker.

• Impedance: The schematic assumes a 4-ohm load for full power rating. The output transformer (if present in tube units, rare in this model) or output stage is designed to drive this specific impedance efficiently.

Conclusion: The Value of an Accurate Schematic

The Peavey MAX 115 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.

Whether you are chasing a ghost hum, rebuilding a blown power supply, or modding the DDT circuit for tighter low end, the schematic is your map. Title: Technical Analysis & Service Report: Peavey MAX

Ready to dive deeper? Access the exclusive, full-resolution Peavey MAX 115 schematic (Rev C & D), annotated component layout, and voltage checklist below.

Abstract

This document analyzes the schematic architecture of the Peavey Max 115 bass amplifier. The unit is historically known for utilizing Peavey’s "_transtube" solid-state technology or modern Class D topology depending on the revision year. This paper dissects the three main stages found in the schematic: The Pre-Amplifier (Op-Amp based), The Power Amplifier (MOSFET/Transistor output), and The Power Supply (Switching vs. Linear). Special attention is paid to Peavey’s proprietary feedback loops and protection circuits.