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Item Tag: 7591A

  • Sylvania 7591a -Display Only-

    Beautiful vintage tubes but all are duds or very low GM. Sold first display only. Asis no returns

  • Sylvania 7591 7591A Excellent Value NOS NIB

    The tube was carefully tested on my TV-7D/U as shown in the photos with 36 min good (55-56=100%). It sounded wonderful on my hifi system with other 3 new tubes. Super rare and hard to find now.

  • RCA 7868 7591A 7591 EL506 Black Plates Super Rare Tested NOS Matched Quad

    These tube can be use to substitute 7591 with adapter sockets which bring you stunning sounding quality. That’s the fact. The price is not included sockets. They sound wonderful in my hifi system.

  • 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

  • NOS NIB 7591A SYLVANIA Grey Plate “O” Getter Made in USA Amplitrex Tested

    NOS NIB 7591A SYLVANIA. Tested Advance Digital Tube Tester Amplitrex AT1000. Like Amplitrex AT1000 Advance Digital Tube Tester. “O” Getter. Grey Plate. Hickok 752a tube tester, AVO Type 160. We specialized in thoroughly tested and screened quality.

  • Sylvania 7591 7591A Excellent Value NOS NIB

    The tube was carefully tested on my TV-7D/U as shown in the photos with 36 min good (55-56=100%). It sounded wonderful on my hifi system with other 3 new tubes. Super rare and hard to find now.

  • Sylvania 7591 7591A Used Good Testing Values Red Prints

    The tube was carefully tested on my TV-7D/U at 52/36 min good (55-56=100%). It sounds wonderful on my hifi system with other new tubes. Super rare and hard to find now. What you see is what you get.

  • TWO McIntosh 7591A Tubes / Amplitrex Tested /Strong Plate Current/Close Gm Match

    TWO McIntosh 7591A vacuum tubes. Tested on Amplitrex AT-1000 tube tester (fixed bias mode). 85.6% / 86.8% gm mutual conductance. Tubes test at 8740 and 8860 where 6630 micromhos is pass/fail grade. Tube 1: 8740 micromhos @ 60.6mA plate current emissions.

  • 2x MatchedNOS 7868 GE USA PowerTubes/Fisher Bogen Ampeg /Like 7591A w/Adapter

    + ampeg conn scott sherwood pilot sansui kenwood pioneer eico harmon gibson and even seeburg jukeboxes incorporated these. these oe boxed ge usa classics are collectible for their sound, long tenured history, and top build quality (see their 5star series!).

  • Amplifier 7591 7591A Vacuum Tube Tester V8 Bias Current Checker Octal mA Version

    Octal 8pin probes cable lengh: 55cm. 4pcs Octal 8pin Bias Current Probes. A separate resin board is used at the top. Prevent short circuits making readings incorrect. 03: Then plug V8 tester probes in amplifier socket.