1) holographic sound reproduction (amperex usa/holland + telefunken/valvo/siemens germany + mullard britain + tesla) 
2) long-listen full frequency w/ pleasant extension (valvo holland + siemens/telefunken germany + mullard britain + tesla) 
3) natural organic tonality w/ flat mid band response (amperex usa + telefunken/siemens/valvo germany + mullard britain)
4) precision bass, tone depth, lush sonic resolve (philips usa/holland + siemens/valvo germany + ei yugo + tungsram hungary)
5) warm musical stage w/ luminous dynamics (amperex usa/bugleboy/sq heerlen + siemens/valvo germany + mullard britain)
6) clarity w/ layered detailed tone, musical dynamics (telefunken/lorenz/valvo germany + tungsram hungary + tesla + toshiba)


the breath of life, rare sought after mullard first editions, audiophile crown jewels, incredible transparency and rich warmth
the top sonic echelon 1958-1959 mottled wrinkle-glass outclass all later production w/ a linear mid-band and luminous resolve
live concert realistic sound reproduction and immerstive warm depth is only found on 7l0 editions w/ no tinitus or listen fatigue

this translates into a euphoric sound stage highlighted on premium stereo/audio setups, tube mics, and vocal fidelity playback
the haunting vivid presentation is legendary for a range of singers, acoustic types, instrumental delineation, and percussion
the limited run special seam glass and mullard glass production stamp both contribute to the authenticity collectibility and lore

our gt britain mullard e88cc/6922 gold pin tubes include a tube box, pin protector, and complimentary refurb/deoxit process
known for their longetivity and quality as a premium 6dj8/ecc88 upgrade, the 6922/e88cc are rated at 10k hours lifetime
all tubes are twice tested for mutual gm, and studio sound auditioned for noise-free mic-certified audio grade operation

full pristine conductance test balance 110/110 % mutual gm (65%) + useful life test pass! (a key longetivity indicator)
our unique gm output test applies real world circuit voltages and has an impeccable gas short and leakage test
full studio sound auditioned w/ ultra high resolution closed-back monitors and premium aira preamps
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, several in stock w/ nice to fair silkscreens

~ authentic hifidelity vintage audiophile tube curation by caliacoustics ~
see our official site for new arrivals + reserve/request options + special edition limited runs
+ true-nos sealed box rarities + collectible pinched waist + high-resolution headphones