Description
introduced in 1963, the legendary 7591a was an improved design w/ better screen dissipation and a low-loss base fisher scott sherwood pilot sansui kenwood pioneer eico harmon gibson and even jukeboxes incorporated 7591 tubes warm rich sound reproduction w/ grey plate internals, live-concert holographic sound reproduction w/ vinyl style intimacy legendary taper base w/ thick solid disc getters which is revered for capturing low-register detail and full tone body 2 x old stock ge usa slim bottles w/ visible silkscreens, collectible audiophile crown jewels full mutual gm conductance test, pristine pair: 118 ~ 125 % gm (65 % min good) + important life test pass! (a key longetivity indicator) + impeccable gas test + leak/short check + complimentary refurbish and deoxit process ~ one of a kind value-added quality control 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 authentic vintage hifidelity audiophile / preamp / mic tube curation by caliacoustics, see our website! new arrivals + limited special editions + rare true-nos sealed box + pinched waist + high-resolution headphones