Description

incredibly rare, true nos sealed box vintage preamp audio tubes, carefully curated direct from japan collectors revered by audiophiles, vintage hard vacuum matsu japan 12bh7a are top sonic echelon mullard alternatives! often described as an open tone, dynamic and 3-dimensional, and known for their slightly higher gain than average the british supplied '60s expert engineering via 'transfer of technology' tooling resulted in several audiophile advantages: same anodes, micas, electrode geometry, glass envelope, spot welding, grid wire spacing and cathode processing chemistry! 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 12bh7a are popular tuning choice, 12au7 ecc82 plugin subs, allowing you to hear the signal better w/ less distortion depending on the circuit, these are also more linear and wont compress the signal as much as 12au7 at high voltages plus higher frequency response, additional gain factor, and higher max anode dissipation at higher operating voltages if opened, give several sessions or up to 100+ hours w/ your specific amps voltage to settle in (break-in is important) ships well packed worldwide w/ free economy postage, several available ~ authentic vintage hifidelity audio curation by caliacoustics ~ see our official web site for reserve/request options, new arrivals true-nos sealed box rarities and limited run special editions