<br>Features: <br>Hand welding point to point, the main circuit adopts shed welding <br>Two high-end EI type single-ended output transformers with high-end special technology and high-quality broadband response made of Z11 iron core. <br>High-voltage power supply and filament power supply independently use high-efficiency toroidal, high-power power transformers with Z11 cores and special materials. <br>The front stage uses one 12AX7 and two 6SN7 vacuum tubes; the driving part uses two 300B tubes to amplify the rear stage. <br>The front stage uses a 5U4G for rectification <br>The rear stage uses two 845 vacuum tubes for class A single-ended power amplification. <br>Five groups of signal input A, B, C, (D) BALANCE, E (PREIN) This machine is specially equipped with balanced input function and pure rear stage function <br>Power-on high-voltage delay and mute delay function (about 30 seconds) <br>Infrared function remote control <br>Use Japanese ALPS high-end potentiometer <br>Easy-to-install plug-in vacuum tube shield <br>Peripheral power tube bias current adjustment function and power output level meter sensitivity switch <br> <br>Product parameters: <br>Rated output power: 23W + 23W (RMS)<br>Machine frequency response: 12Hz ~ 35kHz (-1.5dB) <br>Input sensitivity:845 = 300mV <br>Balance input: 280mV <br>pure power stage: 1800mV <br>Input impedance: 100KΩ <br>Output impedance: 4Ω, 8Ω, 16Ω <br>Harmonic distortion: 1% (1kHz) <br>Signal to noise ratio: 90dB <br>Left and right output balance: <0.5dB <br>Power consumption: 380W <br>Vacuum tube: 12AX7 (ECC83s Brand JJ)x 1, 6SN7 x2, 274B x1, 300B x2, 805 x2 <br>Machine volume: (440 * 410 * 275) mm <br>Net weight: 42kg <br>Gross weight: 48kg <br>Power supply voltage: AC 100V to 240V 60Hz/50Hz <br>(there is a 230V/115V voltage change-over switch inside of body)