Item Tag: Preamp Tubes

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 rcathis rare 1950s edition w/ wide track-tip dgetter, captures the most airy articulation, vinyl style intimacy, and sparkley highs the phenomenal black plate carbide coating radiates heat better, dissipates temps faster, and enhance tonal characteristics+ features 4 large oxygen-free copper grids, to minimize cathode current contamination, and better high-temperature control 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 x old stock rca usa black plate gold grid 5687 audio tube, 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, several in stock:tube1: 102/98 % gm ~ tube2: 110/111 % 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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