revered by audiophiles and guitar enthusiasts, early panasonic 12ax7 ecc83 are top sonic echelon mullard alternatives
listener described as an open dynamic tone, 3-dimensional presence, and known for their slightly higher gain than average
translucent highs and warm mid-band tone euphony, live-concert style delineation between instruments vocals and percussion
take your listening experience to a higher level of dimensional engaging detail, immersive harmonic imaging and transparency
transform sound reproduction and realistic playback across multiple genres w/ rich bass depth and holographic textured resolve

these seam-top production feature british supplied engineering and audiophile transfer of technology w/ several key advantages:
same anodes + micas, electrode geometry, glass envelope, spot welding, grid wire spacing and cathode processing chemistry!

set of 2 old stock 12ax7 ecc83 matsu audio tubes w/ nice to fair silkscreens
carefully curated direct japan import, w/ plain or branded boxes

full mutual gm conductance test, several pairs in stock:
pair1: 81/80~85/80 % gm ~ pair2: 76/75~75/74 % gm (65 % min good)
pair3: 84/74~72/82 % gm ~ pair4: 71/70~72/70 % gm pair5: 80/80~80/80 (sold) % gm (65 % min good)

+ important life test pass (longetivity indicator) + plus an impeccable gas test / leak / short check
 + complimentary refurbish and deoxit process ~ one of a value added quality control

give several sessions or up to 100+ hours w/ your specific amps voltage to settle in / break-in
ships well packed worldwide w/ free economy postage!

~ authentic vintage hifidelity audio / power / preamp / mic tube curation by caliacoustics ~
see our official web site for new arrivals + reserve/request options + true-nos sealed box rarities 
+ limited run special editions + pinched collectibles + high res headphones