another audiophile grail ranked classic!
6922 amperex heerlen holland pq rare 7l4 series w/ wide curve dgetter
incredible frequency resolution bass euphony and transparent imaging, lush cymbal style dutch resolve
expansive vocals immersive sound stage, great upgrade for preamps stereos mics and more
revered 1959 delta 9 etch code authentic collectible w/ box
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6922 are also known for their mid-bloom depth and immersive tone due to frame grid internals
this old very early production tube has the most precious metallurgy = better sound reproduction and warmth
always handle with care to prevent microphonics (or try popular dampeners to tighten up vibe / response)
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full amplification test balance 94/96 % mutual gm (65% good) and useful life test pass! + leak short gas check
all tubes also undergo a complimentary proprietary value-added refurb process, one of a kind seller qc
give 100+ session hours at your specific amps voltage before final assessment due to long term hibernation
ships fast well packed worldwide, combined postage is available
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~vintage hifidelity audio curation by caliacoustics~