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namely the RCA 5U4G tube
6dB means the noise floor is essentially inaudible even with sensitive studio headphones
It has it's own adjustable crossover
Chord Ultima 2 mono power amplifier (single unit)
Cayin HA-3A Accessories namely the RCA 5U4G tubeThe Cayin HA 3A is a compact transformer coupled, balanced driven vacuum tube headphone amplifier, the fourth and final piece of Cayin's transformer coupled tube amplifier lineup, bridging the gap between the HA 1A MK2 and the HA 6A. Built with the same design principles and hand wiring standards as the HA 6A and HA 300 MK3, the HA 3A packages genuine transformer coupled tube amplification into a desktop form factor roughly the size of a sheet of A4
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