harkening back to a time before ai descriptions, to the radio/tv/tube era, leading to solid state bass + the transistor tech wave

these old metallurgy types are highly sought after, walking the line between transparency, and old school warmth + realism

tweak, tune-up + transform your harmonics, measured feedback, tonal articulation, warmth, and sound system definition
elevate your immersive listening across genres and musicality types, w/ richer bass depth, + textured resolving acoustics


audiophile crown jewel tungsol (est. 1907), revered for their attention to detail, craftsmanship, design, and playback qualities

these vintage classics feature high resolution dual-dgetters, + military selection screening process, and chalky domino plates

this legendary darker carbide plate material radiates heat, reduces plate temps, and enhances tonal + breakup characteristics 

tungsols open sound stage provides super accurate positioning while spacious, and a flat balanced low-end, all while smooth

often ranked vs. telefunkens house sound! the grail domino plates are legendary for balanced dynamics, w/ tight yet deep bass


the 5998 is a powerful upgrade, or 6as7 6080 421a 6520 plugin sub/altv, visible with chatham license labeling back then

w/ same heater current as 421a, there are subtle differences in plate dissipation + plate current + heater-cathode voltages
featuring high conductance of 14k gm mmhs (20k gm mmhs for 421a) + an amplification factor of 5.5 (vs 6.1 for 421a)
said to increase detail, w/ better bass response, especially for woo audio, diy otl, crack speedball pre, + bottlehead amps
improve sound stage speed and warmth! w/ low impedance, adjusted gain levels, and a higher amplification factor (5x)


2x old stock 5998 tungsol usa + chatham edtn, selected/screened military, nice printing visible!

includes branded or plain boxes, carefully curated collectible audiophile vintage tubes

6as7/g 7236 6520 5998 6080 6550 kt88 kt90 we421a cv2523 ecc230 A1834


full mutual conductance gm test +leak/short/gas/life/sound tests, pristine pair: 120/125 ~ 120/120 % gm (65)
our high power gm output test measures the entire linear curve (eg-ip), and applies 250v, all w/ filtered dc!
+ undergoes a proprietary refurbish and complimentary deoxit process ~ a one of a kind value-added quality control

give several sessions (up to 150+ run-hours) w/ your specific amps voltage, to fully cure and break-in
this ensures the sound stage opens-up, stabilizes completely, and has no leftover nos muted sonic qualities 
includes branded or plain tube boxes, ships well packed worldwide! priority/express by request

~ authentic vintage hifidelity audiophile preamp / mic / power / rectifier tube curation ~ 
see our new arrivals + our official website + reserve/request special pricing + limited special editions