introduced in 1952, the rugged military grade 5670w is a special quality industrial vintage vacuum tube developed from the 2c51

oe certified for airborne up to 80k feet, premium best-of, popular for a variety of applications including mixers + amp builders

the incredibly low microphonics w/ thick mica vibration damping, and revered solid-disc getter, all contribute to the sonic lore

the sound stage is smooth, warm, relaxed, well suited for many genres, excellent mids, w/ plenty of detail, and punchy tight bass


an ideal upgrade replacing russian + chinese, considered along with tungsol bendix and western electric as audio crown jewels

these oe boxed military issue were specially screened, workhorse long-life, and balanced section match, important for audio use

+ often military devices were in stand-by, w/ periodic testing, and often replaced no matter the duration, yielding a nos burn-in


5670w 396a we2c51 6385 6n3 6Н3П 6n3p 6h3n 6cc42 cv4013


full mutual conductance gm test + leak / short / gas check + life test (longetivity indicator), several in stock
our high power output test measures the entire linear curve (eg-ip), and applies up to 250v, more than many other testers
+ undergoes a complimentary refurbish and deoxit process, a one of a kind value-added quality control

give several sessions (or up to 150+ hours) w/ your amps voltage to break-in and fully cure
this ensures the sound opens up sonically, fully stabilizes, and has no muted nos qualities leftover
ships well packed worldwide w/ free postage! priority/express available upon request

~ authentic vintage hifidelity audiophile power / preamp / rectifier / mic tube curation by caliacoustics ~
see our web site for new arrivals + reserve/request contact pricing options + true-nos sealed box rarities 
+ limited run special editions + pinched waist collectibles + ultra high-res headphones