Lehle Little Dual II Hum-fee and Noise-free ABY Switcher

The Lehle Little Dual II is a high-fidelity ABY amp switcher engineered to route a single instrument signal to two amplifiers without hum, noise, or tonal degradation. At its core sits the high-end Lehle Transformer HZ, which galvanically isolates output A from output B to eliminate ground loops permanently. Microcontroller-driven true-bypass relay circuitry with active pop suppression delivers faster, quieter switching than mechanical footswitches, while the signature mushroom-shaped buttons mount indirectly via springs to protect the electronics board from physical stress.

Two selectable operating modes allow independent activation of each output or alternating selection between amplifiers. High-intensity LEDs clearly indicate switching status A, B, or both even under stage lighting. Gold-plated phase inverter and ground switch controls optimise signal integrity, while a TRS input switch enables stereo or dual-mono operation via a single jack. Dual inputs support stereo effects returns or instruments with two pickups—acoustic guitars, hybrid electrics, double basses—routed to separate amplifier systems in parallel or alternating configurations with complete hum rejection.

Features

• ABY switcher with independent or alternating output control modes
• High-impedance Lehle Transformer HZ galvanically isolates outputs A and B
• Microcontroller-operated true-bypass relay switching with active pop noise suppression
• Gold-plated phase inverter and ground switch for hum elimination
• TRS input switch accepts stereo or dual-mono signals via single jack
• Dual-input stereo routing configuration for effects or multi-pickup instruments
• Spring-mounted mushroom buttons protect electronics board from mechanical stress
• High-intensity LEDs display switching status under stage lighting conditions