
LAB12
hpa
The Lab12 Hpa is an OTL tube headphone amplifier and preamplifier with an integrated USB DAC, manufactured by Lab12. It uses three 6N1P dual-triode tubes, five separate regulated power supplies, a Blue Velvet ALPS potentiometer, and a 5 mm aluminum face panel. It provides two stereo RCA line inputs, one USB input, a stereo line preamp output, and a 6.3 mm headphone output; specifications include 5 Hz–100 kHz frequency response, 50 kΩ input impedance, recommended headphone impedance of 64–600 Ω, and 60 VA maximum power consumption.
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