The THÖRESS EHT Hybrid Triode Mono Amplifier produces robust output power with a unique hybrid topology. This design merges the best characteristics of both vacuum tube and solid-state technologies, delivering acoustic fidelity with unparalleled drive capability.The THÖRESS EHT Mono Amplifier utilizes a unique SINGLE-ENDED ZERO-FEEDBACK topology, known as EHT Topology, which combines a triode gain stage with a MOSFET unity gain output stage, both operated in class-A mode. The design emphasizes low output impedance and thermal stability, enabling the amplifier to drive loudspeakers with challenging impedance and efficiency characteristics effectively. By eliminating the need for iron-cored output transformers, the EHT topology reduces the voltage swing required from the driver, lowering non-linear distortion. The amplifier’s architecture allows for 30, 40, or 50 watts of output power across varying load impedances, making it adaptable to a range of speaker configurations. Moreover, meticulous hand construction and point-to-point wiring techniques enhance reliability and minimize noise, ensuring high fidelity playback that meets the demands of discerning listeners.Key Features Hybrid Topology: The use of SINGLE-ENDED TRIODE combined with a MOSFET output stage provides high idle current and class-A operation, maximizing signal fidelity. Low Output Impedance: This design offers a high damping factor, facilitating optimal control over loudspeakers and improving transient response. Minimalist Design: The absence of feedback in the amplifier’s circuit minimizes distortion and preserves the purity of the audio signal. Gain Adjustment: The 6-position rotary switch allows for fine-tuning the amplifier's gain, providing flexibility to tailor the output for different listening environments. Thermal Stability: The absence of sound degrading protective circuitry contributes to consistent performance and durability under operational conditions. On-the-fly Bass Boost: The bass response is enhanced in higher gain settings, tailored for an enriched listening experience without compromising quality. Technical Specifications Output Power: 30W into 8Ω, 40W into 6Ω, 50W into 4Ω Gain Adjustment: 10dB in positions 5 and 6 of the gain selector Topology: Single-ended zero-feedback vacuum tube MOSFET hybrid Output Impedance: Low output resistance enabling high damping factor Construction: Hand-built with point-to-point wiring Cooling: Operates with impeccable thermal stability Signal Class: Class-A operation
