Item Tag: Preamp Tubes

1 x Rare NOS BronzePlate GoldGrid RCA 5687 USA GrailAudioTube ~ 7119 E182CC 7044

revered for their craftsmanship, sonic qualities, attention to detail and design, radio corp of america are audiophile crown jewels rca has a long and tenured history, premium metallurgy, long life, and oem sound to many amps during the height of the tube era! sweet, musical, and detailed, the spatial sound stage dances from note to note w/ depth and subtle resonant creamy warmththe neutral harmonic coloring, dimensional frequency bloom, and great dynamics, all contribute to the collectible lore of old rca the phenomenal nickel and tungsten bronze plate design radiates heat better, and enhance tone and warmth characteristics + features 4 gold rods w/ copper grids to minimize cathode current contamination, and better high-temperature dissipation the 5687 is a unique general purpose audio tube that can be used at high current and low voltage, making it high in perveance plus highly regarded for incredibly low distortion, and peak-current capability, far in excess of more conventional drivers 1 old stock rca usa bronze plate gold grid 5687 audio tube w/ nice silkscreen, and w/ rca box includedtwice tested audio grade + complimentary value-added refurbish+deox process! one of a kind quality control full mutual conductance gm test, pristine nos, 2 in stock: tube1: 94/96 % gm ~ tube2: 125/115 % gm (65 % min good)our high power gm output test applies up to 250v, more than many other testers, simulating real circuits+ useful life test pass (longetivity indicator) + an impeccable gas/leak/short check especially popular in dht amps, here is a very extensive application list for 5687 compatible uses:Audio Note M3, Manley Jumbo Shrimp, Ayon CD player, Audio Note DAC 5 Signature and Audio Note amp kitsM5 preamp, M9, KR Enterprise 32BSI integrated SET amp, Modwright 9.0, Denon modded CD playersSony NS999ES CD player, Opera Audio Consonance Cyber 800, Cyber 211, Zanden, LUX 300B amp,Kondo M1000Artemis Labs linestage amp, Emotive Audio Sira, Ray Samuels B52 and Raptor, Audio Tekne TFM-9412Sonic Frontiers Power 2, Audio Experience balanced A2 pre, Ongaku, Audio Note, New Audio Frontiers Legend II preLoth X JI300,Audio Thrills, Mastersound, Sophia Electric KT88 Tube Amp, Icon Audio PS3 phono power supplyAlmarro, Bottlehead, Aria VW5X, Audion 845 Black Shadow, Jinro Amp, Bullplugs + more! give several sessions (up to 150+ hours) w/ your amps voltage to fully cure / break-inships 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

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1 x NOS Military 12AT7WC 6201 Audio Tube ~ Premium Grade Low Noise ECC81 12AT7

audiophile crown jewels! these vintage military tubes are known for their balanced sound stage through the musical spectrumfeaturing a distinct discreet bass profile, airy tonal extension, and a flat natural mid-response, highly musical, neutral and sweetthis uncolored crystal clear sound reproduction is revered for a variety of genres, w/ minimal compression and subtle warmth these premium low noise long life 12at7wc also adorn the top sonic echelon 6201 series etch, the best-of 12at7 ecc81 upgradethe high level military screening process ensured the best quality for mission critical apps, less microphonics + vibration controlelevate your playback whether its blue jazz rock or classical, the incredibly low noise floor make these a perfect fidelity upgradethe long and tentured historical lore of general electric includes their sound quality, premium metallurgy, and craftsmanship 1 x old stock premium military grade ultra low noise 12at7wc 6201 (top grade 12at7 ecc81)w/ nice green label silkscreen, visible ge ‘dots’ etch code, and oe box included ~ several in stock full mutual conductance test, pristine 100/100 % mutual gm (65 % min good) + important life test pass (longetivity indicator)+ leak / short / gas check+ complimentary refurbish and deoxit process ~ one of a kind value-added qc give several sessions (up to 100+ hours) w/ your specific amps voltage to fully cure / break-inships well packed worldwide w/ free economy postage! ~ authentic vintage hifidelity audio / preamp / mic / power tube curation by caliacoustics ~see our official site for new arrivals + reserve/request options + true-nos sealed box rarities + limited-run special editions + pinched waist collectibles + high res headphones

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Strong pair of GE 5814A (12AU7) preamp tubes – tested VG 2700/2750 & 2900/2850

This product is a pair of vintage GE 5814A preamp tubes, known for their high-quality performance. The tubes have been tested and have a strong pair with readings of 2700/2750 and 2900/2850, ensuring reliable and consistent audio output. These vacuum tubes are a valuable addition to any vintage audio setup, providing a touch of nostalgia and character to your sound system. With the trusted GE brand and specific model number, you can expect top-notch quality and performance from these vintage preamp tubes.

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1 x RareTrueNOS SealedBox Matsu/Mullard 6CA7 EL34 ~ HolyGrail Vintage PowerAudio

highly revered by collectors, enthusiasts, and audiophiles, very early panasonic are top sonic echelon mullard xf alternatives!listener described as open rich tone, very dynamic and 3-dimensional, and known for their very high quality premium metallurgytranslucent 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 engaging detail, immersive harmonic imaging, and pure tonal transparency transform sound reproduction w/ more realistic playback across genres w/ rich bass depth and holographic textured resolvelatest listener sonic review: “great balance across the whole range, simply wonderful rich full sound” old production featuring british mullard supplied engineering, and audiophile transfer of technology ~ advantages include:same anodes + micas, electrode geometry, glass envelope, spot welding, grid wire spacing and cathode processing chemistry! 1 x 6ca7 el34 sealed box true nos! very rare unopened condition, carefully curated direct from japan if ever opened, give several sessions or up to 150+ hours w/ your amps voltage to break-in / settle-inships well packed worldwide w/ free economy postage! ~ authentic vintage hifidelity audio / power / preamp / mic tube curation by caliacoustics ~see our official web site for new arrivals + reserve/request options + true-nos sealed box rarities + limited run special editions + pinched waist collectibles

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