Description: Mono tube amplifier with self-regulating autobias pentode circuit, class-A (low power) and class-A/AB (high power) modes, Eco Mode, touchscreen control. Requires 20A power cord. Output tubes: (6×) matched KT120 per amp (KT150 or KT170 optional). Input tubes: (2x) 12AU7, (1x) 12BH7. Inputs: One XLR (balanced), 1 RCA (single-ended). Outputs: One pair binding posts. Power output: 160W class-A (22dBW into 8 ohms), 280W high power A/AB mode (24.5dBW into 8 ohms). THD: <0.1% at 10W into 4 ohms. Frequency range: 15Hz–80kHz. Input sensitivity: 1V RMS low…
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Sidebar 2: Associated Equipment
Digital sources: dCS Varèse music system; Innuos Nazaré Music Server and PhoenixNET network switch; Small Green Computer Sonore opticalModule Deluxe (2); Broadcom/Avago AFBR-5718PZ 1GB SX-SFP, Gen 5 Fiber Optic modules (2); Nordost QSource linear power supply (2); Sonore Audiophile Linear Power Supply; Synology 5-bay 1019+ NAS with Ferrum Hypsos linear/switching hybrid power supply; ASUS AX6000 and RT-AX88U Pro mesh routers and Netgear Nighthawk modem; Apple 2023 iPad Pro and 2025 MacBook Air.
Preamplifiers: EMM Labs PREi, Octave Audio Jubilee.
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Sidebar 3: Measurements
For logistical reasons, I measured a different sample from those auditioned by JVS; it had the serial number 72519930. JVS had told me that he performed all of his auditioning using KT120 tubes and with the Power set to Low, which means the output tubes operate in class-A up to the maximum power. Accordingly, I left the KT170 tubes in the box and after the six KT120 tubes had been installed, I turned the amplifier on, waited for the warm-up time to end, and used the touchscreen on the amplifier's top panel to set the tube type to "KT120" and the Power to "Low."…