Description

revered by audiophiles, these vintage hard vacuum early panasonic 6fq7 are the top sonic echelon mullard alternatives! translucent highs w/ warm mid-band tone euphony, live-concert delineation between instruments, vocals, acoustics, 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 the high quality control, premium tube-era metallurgy, and low noise clear sound reproduction, all contribute to their sonic lore seam-top british mullard supplied expert engineering via 'transfer of technology' tooling, w/ several audiophile advantages: same anodes, micas, electrode geometry, glass envelope, spot welding, grid wire spacing and cathode processing chemistry! 2 x matched old stock 6fq7 matsu preamp/audio tubes w/ nice silkscreens carefully curated via direct japan import w/ branded or plain boxes full mutual gm conductance test, several pairs in stock: 102/102 ~ 102/102% mutual gm (65% good) our unique high power gm output test applies up to 250v w/ filtered dc, more than other testers + useful life test pass (longetivity indicator) + an impeccable gas/leak/short check + complimentary refurbish and deoxit process, one of a kind value-added quality control give several sessions (up to 100+ hours) w/ your amps voltage to fully cure / break-in ships well packed worldwide w/ free economy postage! ~ authentic vintage hifidelity audio / mic / power / preamp tube curation by caliacoustics ~ see our official site for new arrivals, limited editions, sealed-box true-nos rarities, and more collectibles