1) holographic sound reproduction (amperex usa + telefunken / siemens germany + mullard gt britain + heerlen holland) 
2) long-listen full frequency w/ pleasant extension (heerlen holland + siemens germany + mullard gt britain + tesla czech) 
3) natural organic tone w/ flat mid band response (amperex usa + telefunken / siemens / valvo germany + mullard mitcham)
4) precision bass w/ depth and lush sonic resolve (heerlen holland + siemens / valvo germany + ei yugo + tungsram hungary)
5) warm musical dynamic sound stage (amperex usa / heerlen + siemens / valvo germany + mullard blackburn + bugleboy)
6) clarity w/ layered detail and subtle tone compression (telefunken / lorenz germany + tungsram hungary + tesla czech)

amperex usa 'pq' premium quality 7308 are sound system purifiers, a top sonic echelon classic! pure clarity kings
incredible rich warmth, lucid lively immersive tone, and clear depth resolution w/ pin point accurate bass stage
liquid euphoric extended imaging w/ effortless full frequency presence, and truly natural 3 dimensional stage
natural tone transparency brings vocals and sound reproduction to life w/ a high level of detailed vinyl style intimacy
more punchy neutral dynamics w/ full tone body compared to sweet sparkley 'dutch house' holland e188cc variety

the crown jewel of audiophile collections, 7308 have an expansive larger birds-eye-view stage compared to 6922
this brings out additional nuanced detail w/ less noise and more rugged internals for amps that require the best longetivity
the premium quality moniker is revered worldwide by listeners for hifidelity preamps and tube mics, long life 10k hour build
add better bass and luminous fidelity today w/ these sought after collectibles, matched pair, amperex boxes included
nice silkscreens and authentic hicksville ny vr5 *3/ vr5*5 usa etch codes from 1963/1965, grail ranked best years!
all tubes are twice tested and studio auditioned for noise and microphonics, phono grade / mic certified

pristine conductance balance 119/118 ~ 116/116 % mutual gm (65) + useful life test pass (longetivity indicator)
our dynamic output mutual gm test applies 225 vdc simulating actual operations w/ filtered dc + leak short gas
all tubes also undergo a proprietary complimentary refurb and deox screening process, one of a kind qc!
give several sessions / 100+ hours w/ your specific amps voltage for full breakin
ships fast well packed worldwide w/ amperex boxes

authentic vintage hifidelity audiophile / preamp / mic tube curation by caliacoustics
see our official site for new arrivals, reserve/request options, and limited run rarities
+ special editions + true-nos sealed box + pinched waist varities + high-resolution headphones