The Peavey MAX 115 schematic reveals a sophisticated solid-state design centered on high-efficiency power delivery and versatile tone shaping. As a 60-watt to 300-watt (depending on the specific generation) bass combo, its internal architecture is built around Peavey's patented TransTube® technology and the speaker protection system. Equipboard Preamp and Tone Shaping
The input stage of the MAX 115 is designed to handle a wide range of signal levels through attenuated active and passive inputs. TransTube® Circuitry:
This stage utilizes proprietary solid-state components to emulate the harmonic distortion and dynamic response of a tube amplifier. The "TT Boost" switch increases gain to produce a characteristic "growl" without significantly altering the overall output volume. Equalization (EQ):
The schematic incorporates a semi-parametric EQ section. This typically includes a three-band setup (Bass, Middle, Treble) with a dedicated
switch to adjust the center frequency of the middle control, allowing for precise tonal sculpting. Voicing Options:
Many MAX 115 models feature exclusive voicings such as "MAX," "Vintage," and "Modern," which modify the internal EQ curve and gain structure to suit different playing styles. Equipboard Power Amplification and Protection
The power section of the MAX 115 is engineered for reliability under heavy load. DDT™ Speaker Protection: A critical component of the schematic is the Distortion Detection Technique (DDT)
compression circuit. It monitors the power amp's output and automatically reduces gain if clipping is detected, protecting the 15-inch heavy-duty woofer from "square wave" damage. Class D Topology: Newer 300-watt versions of the MAX 115 utilize lightweight
power amp modules. This allows for high power output with minimal heat generation, which is often managed by a dedicated power supply PCB. Psycho-Acoustics:
The circuitry may include a "Psycho-Acoustics" button that adds subharmonic frequencies, creating a perception of deeper bass than the cabinet might physically produce otherwise. Full Compass Systems Connectivity and Maintenance
The schematic layout provides several professional-grade routing options. Direct Out (DI): An XLR balanced output includes a Ground Lift
switch to eliminate hum caused by ground loops when connecting to mixing consoles. Auxiliary and Effects:
The board includes a post-EQ effects loop and specialized inputs for headphones and media players (CD/Aux) for practice sessions. Serviceability:
Full schematics and bills of materials (BOMs) for the MAX 115 (such as assembly 99060580) list over 150 components, including specific op-amps, transistors, and diodes used in the preamp and power stages, making them a standard reference for electronics repair. Equipboard for a repair or see how this design compares to other Peavey MAX models? Peavey Max 115 Bill of Materials | PDF - Scribd
Let’s walk through a real-world repair. Your MAX 115 blows the main fuse (F1 3A/250V slo-blo). Here’s what the schematic tells you:
After replacing these four components, your MAX 115 will outlast a new $600 combo amp.
The MAX 115’s internal speaker is 8 ohms. Adding an extension cab (minimum 4 ohms) stresses the amp. Cut trace to J5 and add a 4.7 ohm/5W resistor in series with the internal speaker when a jack is inserted (per the unused pads on the PCB).
In an era of lightweight Class D amplifiers and DSP modeling, the Peavey Max 115 remains a relevant, repairable tool. It has a soulful, thick bass response that many modern amps lack. Better yet, it was built before the era of surface-mount components and proprietary ICs; almost every part is a standard, off-the-shelf item.
But to keep it singing for another 20 years, you need more than a multimeter and a soldering iron—you need the Peavey Max 115 schematic exclusive. This document is your key to understanding the voltage relationships, signal flow, and safety thresholds of a classic bass combo. peavey max 115 schematic exclusive
Whether you are troubleshooting a blown output stage, modifying the tone stack, or simply recapping the power supply, do not proceed without the schematic. Seek out the genuine, high-resolution, revision-correct service manual. Your Max 115—and your bass tone—will thank you.
Call to Action: If you’ve successfully repaired or modded your Max 115 using the original schematic, share your experience in the comments below. And remember: Always discharge the filter capacitors before touching any component. High voltage can be deadly.
Disclaimer: This article is for educational purposes. Amplifier repair involves high voltages. If you are not trained in electrical safety, please consult a qualified technician.
Finding an accurate Peavey MAX 115 schematic is essential for maintaining this 300-watt bass powerhouse, known for its mix of classic tone and modern class D efficiency. Whether you are troubleshooting a signal loss or exploring the proprietary TransTube and Kosmos-C circuitry, understanding the internal layout is the first step toward a successful repair. Direct Download & Schematic Resources Because the Go to product viewer dialog for this item.
is a discontinued model, Peavey-authorized schematics are primarily available through legacy databases and community-driven repair sites:
Elektrotanya: Provides a free download of the multi-page service manual, including detailed circuit diagrams and component layouts.
Scribd - Bill of Materials: A comprehensive list of over 150 internal parts for assembly number 99060580, covering everything from integrated circuits to specific resistor values.
Peavey Official Literature: While not a full schematic, the official manual detail blocks for the EQ, DDT protection, and I/O routing. Exclusive Circuit Features
The MAX 115 schematic reveals several "Peavey-exclusive" technologies that define its sound:
TransTube® Technology: This proprietary tube emulation circuitry mimics the harmonic compression of a tube amp. Engaging the "TT Boost" on the schematic often reveals a bypass for the high-end tweeter to deliver a more authentic, gritty overdrive.
DDT™ Speaker Protection: A critical safety circuit that prevents power amp clipping. The schematic shows a compression loop that automatically reduces gain when the signal reaches dangerous levels, protecting the 15-inch heavy-duty woofer.
Kosmos-C (Psycho-acoustic Enhancement): This subharmonic generator adds perceived low-end depth without physically taxing the speaker. On the circuit board, this is often implemented as a dedicated sub-circuit that generates subharmonic frequencies below the primary signal.
HyperVent™ Technology: Exclusive ported cabinet design that uses internal airflow to maximize the response of the 15-inch speaker. Peavey MAX 115 Bass Combo Amplifier - Bajaao
The Peavey Max 115 is a solid-state amplifier that features a 115-watt output, a 12-inch speaker, and a 3-channel preamp. The amplifier is known for its reliability and versatility.
Here's a general overview of the amplifier's circuitry:
If you're looking for a detailed schematic of the amplifier, I can suggest a few options:
Keep in mind that working with electronics can be hazardous, especially when dealing with high-voltage circuits. If you're not experienced with electronics repair or modification, it's recommended to seek the help of a qualified technician.
Would you like more information on electronics or amplifier repair in general? The Peavey MAX 115 schematic reveals a sophisticated
The Peavey MAX 115 features proprietary TransTube emulation and psycho-acoustic low-end enhancement, with technical schematics often located on third-party service sites. Essential repair resources include the assembly 99060580 BOM on Scribd, alongside circuit diagrams available via sites like Elektrotanya. For troubleshooting, ensure proper air circulation around the vents and check for cold solder joints in the Mid-Shift switch. Service documentation can be found on community-supported electronics sites.
The MAX 115 has evolved through different versions (Series I, II, and III), featuring significant shifts in internal architecture.
Power Topology: Modern iterations utilize Class D topology, allowing for a high power-to-weight ratio while maintaining efficiency. Earlier versions were more traditional solid-state designs.
Component List: A standard board assembly (e.g., #99060580) consists of over 150 individual components, including specialized integrated circuits for tone shaping and DDT™ speaker protection. Exclusive Circuitry:
TransTube® Technology: This proprietary solid-state circuitry emulates the response and "growl" of a tube amplifier.
Psycho-Acoustics: An exclusive sub-harmonic generator that adds perceived low-end depth by generating 4th-order harmonics without over-stressing the speaker.
HyperVent™ Technology: Specially tuned ports designed to maximize the 15-inch woofer's potential by reducing turbulence and increasing airflow. Key Specifications Power Output 300 Watts RMS (later models) or 60 Watts (Series I) Speaker Configuration 1 x 15" Heavy-duty woofer + high-frequency tweeter I/O Options
Active/Passive inputs, XLR Direct Out with Ground Lift, 1/8" Aux & Headphone Tone Shaping
3-band EQ with Punch, Mid-Shift (600Hz to 250Hz), and Bright switches Added Features Built-in chromatic tuner with mute Performance Review
Finding a clear, "exclusive" schematic for the Peavey MAX 115
can be tricky because Peavey has released several versions (Series I, Series II, and the newer 300W version) over the years. Guitar Center The Core Schematic: What to Look For
Most technicians and DIYers look for the specific circuit layout that features the DDT™ speaker protection TransTube® emulation circuitry, which are hallmarks of this model. Pitbull Audio Troubleshooting with the Schematic
If you are using a schematic to repair a MAX 115, focus on these common failure points: Input Jack Issues
: A frequent culprit for "no signal" is the PCB-mounted input jack. Replacing this often requires desoldering the board to access the traces. JustAnswer Capacitor Health
: Inspect the large filter capacitors in the power supply section for bulging or leaking, which often causes a loud hum. DDT Protection
: If the amp is stuck in "protection mode" (no sound but power is on), check the voltage at the DDT circuit to ensure it isn't triggering prematurely. Rockford Fosgate Where to Find the Official Documents
While many "exclusive" sites may charge for PDFs, you can often find reliable copies through community resources: Peavey Customer Support
: You can often email Peavey directly with your serial number to request the exact schematic for your specific revision. Technical Communities : Sites like Step-by-Step Repair: Rebuilding the Power Supply (Using the
host active threads where users share high-resolution board photos and schematics for various MAX 115 revisions. Safety Warning Bass amplifiers like the MAX 115 contain high-voltage capacitors
that can hold a lethal charge even after the unit is unplugged. Always discharge these capacitors safely before touching the circuit board.
If you'd like, I can help you find a specific part or walk through a repair step. Let me know: is your amp showing (humming, no sound, cutting out)? do you have (the older 60W or the newer 300W model)? Are you comfortable using a multimeter and soldering iron Peavey MAX 115 300 Watt 1x15" Bass Combo Amp - TalkBass.com
To find the Peavey MAX 115 schematic, your best resources are specialized service manual repositories and community forums. Because this model has evolved from a 60W unit to the more recent 300W Class D version, ensure the schematic you find matches your specific board assembly number (often 99060580). Where to Find the Schematic
Elektrotanya: A reliable source for the official PDF service manual and circuit diagrams.
Scribd: Hosts a detailed Bill of Materials (BOM) listing over 150 components, including part numbers for specific resistors, transistors, and ICs.
The Tube Store: Offers a collection of free Peavey schematics, though they focus heavily on older tube models. Key Technical Specs to Keep in Mind
If you are repairing or modding the amp, these proprietary features are central to its design:
TransTube® Technology: Peavey’s patented tube emulation circuitry that provides a gain boost and mimics tube-like growl.
DDT™ Speaker Protection: A built-in compression circuit that prevents clipping and protects the 15-inch heavy-duty woofer from damage.
Psycho-Acoustic Low-End Enhancement: An exclusive design that adds subharmonic frequencies to increase perceived bass without overtaxing the speaker.
Power Differences: Newer models typically deliver 300 watts at 8 ohms using Class D topology, making them significantly lighter (approx. 22kg) than older 60W versions. Common Repair Tips
Cleaning: Many "fuzzy" or crackling sounds are caused by oxidized contacts. Use an electronic contact cleaner on the input jacks and pots.
Solder Joints: Older Peavey units often develop loose or "cold" solder connections over time; checking the board with a magnifying glass is a standard troubleshooting step.
Replacement Parts: Potentiometers are often circuit-board-mounted. If you need a replacement, check the serial number on the metal barrel to ensure the correct linear or audio taper. peavey max-115 sch - service manual - Elektrotanya
PEAVEY MAX-115 SCH Service Manual download, schematics, eeprom, repair info for electronics experts. Elektrotanya Peavey Max 115 Bill of Materials | PDF - Scribd
Before probing voltages, you must understand the signal path. The Peavey MAX 115 is deceptively simple. It consists of four distinct sections: