GT reissue which have a majority of USA components made on the original General Electric machines, the original tools, dies, materials and processing formulas as acquired from the liquidation for the last American tube factory in Owensboro Kentucky. Stunning clarity, and tone that is reminiscent of Carl Perkins through Jimi Hendrix... both of which mostly recorded through Fender amps in a period when they only use this tube. The most expensive (because of the the high US content)