How a simple single-stage tube preamplifier works Preamplifier. An example of a 20 dB audio gain stage ... you can scale your design to a complete home theater system with 5.1 sound.

It’s a conventional tube amplifier circuit in which the triode is a preamplifier for the pentode power output stage. The pentode is running in class A mode, and the high impedance of its output ...

creating a personalized audio experience. Purists will be pleased to know that the equalizer can be totally bypassed if desired. The C2800 Vacuum Tube Preamplifier features methodically designed ...

There are a couple of reasons I suspect it's taken this long to see a vacuum tube in a pair of headphones. Tubes are hungry ...