raytheon usa has a long tenured history, producing military and industrial grade premium vacuum tubes, as far back as 1925
known for their impressive quality control, craftsmanship, strict testing processes, data sheets, and incredible sound output
their highly regarded catalog was also considered the quietest in-circuit, years before telefunkens late '50s market emergence

revered by audiophiles! exquisite sonic detail, micro-dynamics, neutral, all w/ transparency ~ breath of life vintage raytheon
the smooth yet sweet sound stage reveals phenomenal tonal complexity, punchy highs w/ no edge, and highly musical imaging
this high resolution premium metallurgy reproduces sound w/ incredible definition, like a live-concert in realism and fidelity
the spatial separation, rich harmonics, expansive holographics, and dimensional bloom, all contribute to collectible sonic lore

the highly regarded triple-mica design is rugged and less prone to microphonics, capturing an incredible amount of articulation

this layered 3-mica also protects the grid rods and internals from the getter elements, w/ more stable current-transfer properties

+ these also feature copper/nickel grids, to minimize cathode current contamination, and to improve temperature dissipation


6414 are often utilized by manley pro audio + vtl amps, tall-boys w/ gain in-between 12au7 and 12at7, and similar to 12av7
popular tuning choice for 12au7/12at7 circuits, and designed for computers which adds to its rugged performance capabilities

1x old school raytheon 6414 / 0528 military spec 3-mica audiophile tube, long life 10k hour, w/ box included

full mutual conductance test + leak/short/gas/life checks: several in stock: 6k/6k (sold) 5.5k/5.0k 5k/5k gm mmhs
our high power gm output test measures the entire linear curve (eg-ip), and applies 250v, all w/ filtered dc
+ 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 / fully cure
ships well packed worldwide ~ priority/express by request

~ elevate to warmer hifi! w/ authentic vintage audiophile preamp / power / mic / rectifier tube curation by caliacoustics ~
see our new arrivals + reserve/request pricing specials + parts list (about section) + official site!