2x Vintage Matched Sawtooth Mullard GZ34 5AR4 ~ F32 B3A5 / B3XX etch codes ~ Authentic Blackburn Gt Britain ~ Grail Top '60s Rectifier Tubes ~ Musical Warm Dynamic Liquid Vintage Audio ~ 101/100 102/102 % Gm ~ Faint Labels

an audiophile darling! vintage mullard 5ar4 gz34, a best-of classic, and top sonic echelon rectifier tube, made in gt britain

these old school collectibles will only go up in value, revered long life, premium metallurgy + low noise rich playback qualities, and same codes!

legendary liquid holographic sound reproduction! w/ dynamic bass, lush harmonics, and incredible resolving vocal realism

the highs are polished which is great for a variety of '60 - '70s - '80s+ genre types, w/ vinyl style warmth + lots of silky detail

often dubbed as a beer-pub tonality due to the intimate ambience + airy qualities, only found in these old copper sawtooth type

yet alas by the 1970s these unique sound curves had quickly moved on, w/ transistor tech, solid state bass, + semi-conductors

tweak, tune-up + transform sound reproduction, distortion, measured feedback, tonal articulation, warmth, and definition

(rectifiers are one of the best upgrades especially for resolution chasers)

2x mullard gt britain 5ar4 gz34 audiophile rectifier tubes, blackburn f32 b3a5/ b3xx (faint)

full mutual conductance gm micromhos test + leak/short/gas/life/sound checks, pristine tight balance pair: 101/100 ~ 102/102 % gm (65)

our high power output test measures the entire linear curve (eg-ip) + applies up to 250v, all w/ filtered dc, simulating circuits

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

give several sessions (up to 150+ lifetime hours) w/ your specific amps voltage, to fully cure + break-in

ships well packed worldwide! priority/express by request

~ authentic vintage hifidelity audiophile power / preamp / rectifier / mic tube curation ~