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While many would love to own a $10,000 tube OTL (output transformer-less) amplifier, few are willing to spend that kind of money or endure the heat generated by such a behemoth. Still…if only we could get a taste of such amplifier in a cheaper, smaller package. This is the reasoning that quickly leads to a tube headphone amplifier. While headphones do present a nicer load than most loudspeakers, they are still a hard load for most tubes to handle directly (32 ohms is not that much greater than 8 ohms). Still, with some careful designing, we can come up with a vacuum tube headphone amplifier that meet most of our design criteria. Below is a schematic of the White cathode follower.
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