revered by audiophiles, the vintage zenith 6bq5 / el84 feature the unique sandblasted etch build-dots from general electric usa

this set captures detailed immersive sound reproduction w/ a warm bass stage ~ legendary uncolored neutral imaging

a matched pair and a spare, general electric tubes are sought after for their impressive tonality and high quality metallurgy

1 zenith logo is still visible, boxes in photo are included, and all tubes are twice tested for mutual gm and carefully curated

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full amplification test 99 ~ 95 matched pair + 75 (backup tube) % mutual gm (65 % good) + important life test pass

our life test is a key longetivity indicator, and our unique gm output test applies 225 vdc simulating actual circuit load

all tubes are also checked w/ an impeccable gas + leak/short check, and a proprietary complimentary refurb deox process

give 100+ session hours w/ your amps voltage to fully cure (breakin is important)

ships well packed worldwide, and free economy postage! 

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~ authentic vintage hifidelity audio curation by caliacoustics ~

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