General Information
The new HH-1 headphone amplifier from Cary Audio is an all-new hybrid design, featuring a tube input stage feeding a single-ended MOSFET output stage. These MOSFETs were chosen as they have sonic characteristics very similar to tubes, and the entire amplifier operates fully in class-A at all output levels. It is extremely simple to connect and operate, featuring a pair of RCA input jacks and a loop-through output pair, a power switch and a volume control.
Top quality parts are mounted on a heavy gauge fiberglass circuit board, and only two stages of amplification are used for the shortest possible signal path. A power transformer, rated at three times what is required for the amplifier’s design, feeds a fully regulated discrete power supply for the best sound quality. It is designed to drive headphones with an impedance between 30 and 600 ohms. A 30-second muting circuit prevents any annoying pops and clicks when turning on the HH-1 headphone amplifier, and ensures that all circuits are fully stabilized before each listening session.
Top quality parts are mounted on a heavy gauge fiberglass circuit board, and only two stages of amplification are used for the shortest possible signal path. A power transformer, rated at three times what is required for the amplifier’s design, feeds a fully regulated discrete power supply for the best sound quality. It is designed to drive headphones with an impedance between 30 and 600 ohms. A 30-second muting circuit prevents any annoying pops and clicks when turning on the HH-1 headphone amplifier, and ensures that all circuits are fully stabilized before each listening session.
The old USA tubes however are fabulous IMHO and worth seeking out and paying for. . I personally have been using a very unusual Mullard the CV-2943, which is bright when compared to the Mullard house sound. Besides the Mullard I also like the Hicksville Amperex ikt's a white label tube
In addition the current production tubes by New Sensors are truly good eclipsing many Old Stock tubes. They are truly new and not some pull or find in a repair caddy. You might want to check out the Gold Lion tubes they have been getting very good 'press' . I will stop there, obviously I have just scratched the surface.