old panasonic audiophile crown-jewel, highly revered for incredible sound reproduction, and often compared to mullard sonics

back then, mullards vacuum tube empire was vast, setting up advanced manufacturing facilities worldwide, along w/ philips

this famous 'transfer of technology' provided legendary tube-era metallurgy, engineering, quality, longetivity, and low noise

this same british cathode processing chemistry, anode plates+supports, electrode geometry+glass, resulted in coveted playback

described as a rich full tonality w/ plenty of detail, sweet warm balance, dimensional presence, all w/ translucent airy highs

this elegant musicality is expressive, clean, low noise, all w/ excellent stage dynamics (+ rich liquid overdrive in guitar amps)

this quite versatile warm classic, reproduces a smooth extended sound profile, reveals lush mids, and has a defined low-end

tweak, tune-up + transform your playback w/ more or less harmonics, measured feedback, warmth, and system fidelity

12ax7 ecc83 cv4004 5751 e83cc ecc803 6057 6681 7025 7058 7729 b759 m8137 12rhh14

2x old stock 12ax7 ecc83 panasonic, rare 1960s editions, 65+ year-old silkscreens fair yet visible

includes plain or branded tube boxes, carefully curated classic audio tubes (several pairs available)

full mutual conductance test + leak/short/gas/life/sound checks, pristine balanced pair(s): 95/94 ~ 94/94 % gm (65)

our high power output test measures the entire linear curve (eg-ip), and applies 250v, all w/ filtered dc

+ undergoes a complimentary refurbish and deoxit process ~ one of a kind value-added quality control

give several sessions (up to 150+ hours) w/ your specific amps voltage to break-in / cure

this ensures the sound stage fully opens up, w/ no muted nos qualities leftover

ships well packed worldwide! priority/express by request

~ authentic vintage hifidelity audio / power / preamp / tube mic / rectifier curation ~