4x Vintage UFO Foil-Disc GE USA GL Military 5751 Audio/Preamp Tubes ~ Holy Grail Balanced Sound Stage Detailed Vintage Warmth ~ Rugged 12AX7 ECC83 Upgrade / Plugin Sub / Lower Gain ~ ecc803 e83cc cv4004

vintage general electric, highly revered, for their durable work-horse reliability, low noise floor, and clear sound reproduction

their reknowned 5-star series featured impeccable era engineering, rivaling top tier rca command and sylvania gold editions

5-star metallurgy is a super premium quality control, reserved for the best-of selection, w/ several key advantages for audio:

plated grids, higher heater current to avoid burnout, better operator build conditions, thyratron welding, binocular inspection 

+ additional mica shielding, sturdy anode cages, polished anti-microphonic grids, heater cycling, and a 50-hour aging process

audiophile crown jewel military 5751, top sonic echelon, known for their detailed treble, sound stage balance, and solid bass

these early '60s are sought after for their holographic transparency, low-register vinyl style intimacy, and articulate definition

these limited-run floating ufo disc getters feature a copper neck, for a rich wide bloomy fidelity + great for a variety of genres

long life low-noise (7025/ecc803/e83cc equiv) also have great head room, and are less susceptible to rattle or drift over time

tweak, tune-up, or transform your harmonic distortion, measured feedback, tonal articulation, warmth, and system definition

take your listening playback and vocal experience to a higher level of dimensional engagement, w/ rich immersive imaging

these old production types capture unique frequency euphony, for a variety of instrumentals/acoustics, w/ more ethereal qualities

the high power 5751 are premium 12ax7 ecc83 w/ slightly less gain, introduced in 1949, as military spec + industrial grade

originally designed for aviation, the costly 5751 design is more rugged + less prone to microphonics, w/ higher power 175ma

this subtle higher current upgrade (12ax7 = 150ma) and 30% less gain, is a great way to upgrade your sound stage fast

this reduced compression affects your overdrive, which is great for higher volume + adding a touch more dynamics

4x old stock ge usa military edition 5751, low gain 12ax7 ecc83 sub, nice silkscreens w/ etch 'dots', and ge boxes included

+ also includes freebie high-density high-temp distortion-reducing tube dampeners (not made in china) and pin protectors

full mutual conductance test, balanced quad 101 % gm (65) + leak / short / gas check + life test (longetivity indicator)

our high power output test measures the entire linear curve (eg-ip), and applies up to 250v, more than many other testers

+ also undergoes a complimentary refurbish and deoxit process ~ one of a kind value-added quality control

always give several sessions (up to 150+ total hours) w/ your specific amps voltage to break-in and cure

this ensures the sound stage opens-up sonically, fully stabilizes, all w/ no 'muted' nos qualities left

ships well packed worldwide