introducted back in 1958, westinghouse was one of the first to manufacture 7591, high quality and sourced by many oems!fisher scott sherwood pilot sansui kenwood pioneer eico harmon gibson and jukeboxes were just a few to incorporate 7591this audiophile crown jewel is soughy after, westinghouse 7591 w/ very nice silkscreen, made specially for eico brandwarm sound reproduction w/ grey plate internals, live-concert holographic imaging w/ vinyl style intimacylegendary heavy glass w/ thick hollow getter (like telefunken) made in 1964, includes plain or branded box full mutual gm conductance test, pristine 105 % gm (65 good) + important life test pass! (a key longetivity indicator)our special gm output test applies real world 225vdc voltages w/ filtered dc, plus an impeccable gas test + leak/short checkwe also pride ourselves on a proprietary complimentary value-added complete refurb screening deox processgive 100+ session hours w/ your specific amps voltage to fully settle in (break-in is important)ships well packed worldwide w/ free economy postage, 3 available 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
Item Tag: 7591 7591a 7868
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NOS Zenith 7591A Preamp AudioTube ~ HolyGrail Vintage USA ~ WarmSolidDiscGetter
introduced in 1963, the legendary 7591a was an improved design w/ better screen dissipation and a low-loss basefisher scott sherwood pilot sansui kenwood pioneer eico harmon gibson and jukeboxes were just a few to incorporate 7591arevered by audiophiles, the copper neck solid-disc float getter zenith 7591a captures an incredible amount of low-register detailwarm sound reproduction w/ grey plate internals and black plate upper heat dissipator for live-concert holographic imagingthis collectible intimate vinyl style classic also features a pristine silkscreen and original box, plus twice tested for mutual gm full conductance test, pristine 110 % gm (65 good) and 10750 micromhos + useful life test pass! a key longetivity indicatorour special gm output test applies real world 225vdc voltages w/ filtered dc, plus an impeccable gas test + leak/short checkwe also pride ourselves on a proprietary complimentary value-added complete refurb screening deox processgive 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!+ limited special editions + rare true-nos sealed box + pinched waist + high-resolution headphones