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This document provides service information for the Laney TFX3, a classic British amplification guitar amplifier. It includes schematics for the preamp, output stage, and FX control board, along with a comprehensive bill of materials.
The Laney TFX3 is a 120W guitar amplifier designed for a range of tones, from clean to overdriven, with integrated effects. The amplifier features a multi-stage preamp, a robust output stage, and a digital effects (DSP) module for various sound enhancements.
The preamp section (TFX2/TFX3 PREAMP ASSY, part number 007985) is designed to shape the core tone. It includes multiple gain stages, tone controls (Treble, Mid, Bass), and separate channels for "Clean" and "Drive." The "Drive" channel offers additional gain and saturation, with controls for "Drive 1" and "Drive 2" levels, allowing for a wide spectrum of distorted sounds. A "Bright On/Off" switch is available to add high-frequency sparkle to the tone. A "HUM TRIM" adjustment is present, likely for minimizing unwanted noise in the preamp.
The output stage (TFX3 OUTPUT PCB ASSY, part number 007989) is responsible for amplifying the processed signal to drive a loudspeaker. It utilizes SAP16N and SAP16P power devices, configured in a push-pull arrangement, to deliver 120W of power. A "BIAS ADJ" (VR2) control allows for fine-tuning the quiescent current of the output transistors, which is crucial for optimal performance and longevity. The output section also includes protection circuitry, such as fuses and diodes, to safeguard the amplifier. An "Extension Loudspeaker" output (SK4) is provided, allowing connection to an external speaker cabinet.
The FX control board (TFX3 FX CONTROL PCB ASSY, part number 007987) manages the integrated digital effects. It interfaces with a DSP module (HD1) and provides controls for "Clean FX Program," "Drive FX Program," "Clean Reverb Level," and "Drive Reverb Level." The "FX SEND" and "FX RETURN" jacks (SK2, SK3) allow for external effects processors to be integrated into the signal chain, offering flexibility in sound customization. The "OFFSET ADJ" (VR1) on the FX return path is likely used to balance the signal levels.
A footswitch (TFX4 FOOTSWITCH) is provided for remote control of key amplifier functions, including "CLEAN," "DRIVE1," "DRIVE2," and "FX." This allows musicians to switch between different channels and engage/disengage effects during live performance. The footswitch connects to the amplifier via a 4W loom.
The TFX3 is designed for versatile use by guitarists. The separate Clean and Drive channels, along with their respective volume and tone controls, allow for quick changes between different sonic textures. The "Bright On/Off" switch provides an instant tonal modification for brighter or warmer sounds. The "Vibe On/Off" and "Mute" functions offer additional control over the amplifier's output.
The integrated digital effects, controlled via the FX control board, provide a range of built-in sounds, enhancing the amplifier's capabilities without the need for external pedals. The "FX SEND" and "FX RETURN" loop allows for the integration of preferred external effects pedals or rack units, offering further customization of the sound.
The footswitch connectivity is a key feature for live performance, enabling seamless switching between channels and effects without interrupting playing. The "Extension Loudspeaker" output allows for connecting to larger or different speaker cabinets, providing flexibility for various venues and sound preferences.
The service information provides critical details for maintenance and repair.
General| Brand | Laney |
|---|---|
| Model | TFX3 |
| Category | Musical Instrument Amplifier |
| Language | English |
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