four.valve Limited 55 Edition rotary mixer

Overview To mark 55 years of the Technics SL-1200, Union Audio has created the four.valve Limited 55 Edition. Based on the four.valve, the Limited 55 combines its valve-based analogue architecture with selected design elements from the elara range, including the aluminium front panel and knurled control knobs. The mixer also features weighted fader knobs and wooden side trims from the Signature Series, with gold anodised bezels and artwork designed to complement the Limited Edition SL-1210 MK7. Only 550 individually numbered units will be produced. Product Description The Limited 55 retains the four.valve's valve circuitry and fully analogue signal path, delivering the harmonic character and natural compression that define the four.valve design. A custom discrete op-amp designed by Union Audio founder Andy Rigby-Jones has been developed specifically for this edition, forming part of the analogue signal path. The physical design combines elements from across the Union Audio range. The aluminium front panel and knurled controls are taken from the elara family, while weighted fader knobs and wooden side trims come from the Signature Series. Gold anodised bezels and artwork complete the finish, while the VU meters feature a phosphorescent treatment. The result is a four.valve with a distinctive new finish and a combination of design details not found on any other Union Audio mixer. Tech Specs Distortion plus Noise (THD+N) un-weighted 0dBu, 20Hz to 20kHz, Line In to Mix Out +4dBu 0.1% Typically Frequency Response Line in to Mix Out +/-1dB 20Hz - 50kHz RIAA Accuracy +/-1dB 20Hz to 20kHz Shutoff and Crosstalk Fader Shutoff > -80dB L/R Crosstalk Line in to Mix Out 1kHz <-75dB Noise 22Hz to 22kHz Un-Weighted Residual Output noise <-92dBu Line In to Mix Out Unity <-85dBu Maximum Output Level Mix Out 0.5% THD +27dBu Dynamic Range Dynamic Range 116dB EQ and Filter Frequency Channel High-Pass Filter Fully Clockwise -3dB/1500Hz Master 3 Band Isolator 200Hz, 800Hz, 2000Hz Headphone Amplifier Maximum output level 750mW RMS - 33 ohms Power Supply Type External SMPSU Mains Voltage range 90-260VAC Output 18V DC 30-40W Efficiency LEVEL VI Dimensions Dimensions - four.valve Mixer Height 100mm (inc. knobs) Mixer Width 365mm Mixer Depth 283mm Weight 4.75kg Packed Dimensions - Four.valve Size L x W x H 48cm x 38cm x 20cm Weight 7kg User Guide four.valve Limited 55 Edition user guide