The 6J2 is wired as a triode, and because a common-cathode circuit is designed to drive a high impedance, it’s safe to assume this won’t be a very good headphone amplifier. It’s a simple ...

The fairly conventional circuit of the tube amplifier ... It would be interesting to subject it as a headphone amplifier to a series of audio tests to evaluate the effect of a mains transformer ...

A D/A converter and headphone amplifier in one box. In lieu of connecting headphones to the analog audio-out headphone jack found on every computer and mobile device, the DAC/headphone amp ...

In addition to headphone amplifier and preamplifier functions, the HA-507 incorporates two independent power supplies (one for audio circuits and one for control circuits). Large toroidal power ...