Description

a long tenured history going back to 1899, revered nec nippon was even utilized during 1960s olympics worldwide broadcast known for their incredible vacuum tube quality, tone and sound reproduction, this oe boxed 6fq7 is a rare direct japan import a classic big sound tube, nec capture and reproduce a neutral balanced smooth sound stage, great bass w/ true authority this vintage production type features the most precious metallurgy of the tube era, life and quality + rich tone warmth this carefully curated classic includes the original fragile 6fq7 box, nice silkscreen, and twice tested for mutual gm full conductance pristine balanced test 104/105 % mutual gm (65% good) + life test pass (a key longetivity indicator) our special gm output test applies real world 225vdc voltages w/ filtered dc + an impeccable gas test + leak/short check we also pride ourselves on a proprietary complimentary value-added complete refurb screening deox process give 100+ session hours w/ your specific amps voltage to fully settle in (break-in is important) ships well packed worldwide w/ free economy postage authentic vintage hifidelity audiophile / preamp / mic tube curation by caliacoustics, see our website + limited special editions + rare true-nos sealed box + pinched waist + high-resolution headphones