An Embedded Hybrid Design

Almost all tube/solid state hybrid amplifiers are made from two separate and independent sections. The tube provides voltage gain and the transistors supply current gain. The tube stage is coupled to the transistor stage with a coupling capacitor.

For this scheme to work properly for headphone amplifiers the transistor buffer must also have an internal output voltage zeroing scheme, usually supplied by a servo mechanism.

The Embedded Hybrid Headphone Amplifier design does not use the standard techiques. Instead, it "embeds" the tube into a standard amplifier topology to create another type of amplifier altogether.