top echelon philips amperex 'hp' holland are legendary, musical balanced sound stage w/ live concert front-row intimate images
warmth w/ soft highs and lots of mid-band body illuminates preamps stereos mics and any 6dj8 ecc88 compatible application
linear transparency and legendary dutch-house resolve adds a cymbal-style resonant sonic aftertaste revered by audiophiles
lore tells us that hp thoroughly screened thousands of tubes for the best quality control/lowest noise/purest sound reproduction
sought after phenomenal tone, selected editions w/ boxes included! authentic vintage heerlen ⊿ etch seam-top '60s production
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pristine balanced conductance test 100/101 ~ 99/100 % mutual gm (65 % good) + life check pass! (longetivity indicator)
our unique mutual gm output test applies 225 vdc simulating actual operations plus filtered dc + leak short gas check~
full sound auditioned w/ closed back high resolution monitors and aira preamps
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give several 100+ session hours w/ your specific amps voltage to break-in
includes amperex boxes and ships free worldwide well packed, several matched pairs in stock
~authentic vintage hifidelity audio curation and refurb by caliacoustics~