http://www.avguide.com/review/headamp-blue-hawaii-se-electrostatic-headphone-amplifier-playback-56 "We close by repeating our suggestion that prospective purchasers need to think about which aspects of the Stax headphones are causing them to pursue elect
headphone amps (e.g., the Woo Audio WES) the Blue Hawaii SE is basically offered in one configuration, with one carefully chosen set of tubes (the aforementioned matched Mullard EL34’s), one power supply, one quality level for all of the other core parts used in the amplifier....
“HeadAmp’s first electrostatic amplifier was the KGSS (Kevin Gilmore solid state) introduced in 2003—at least five years before any competitors decided to support electrostatic headphones. The Blue Hawaii was released in 2004, and the greatly upgraded Blue Hawaii SE began shipping in 20...