another classic audiophile exclusive by caliacoustics! 

rare collectible special edition 12at7 ecc81 direct japan imports

2 matched pristine spec toshiba audio preamp tubes, hard to find hi-fi / hi-s editions!

often dubbed the telefunk of japan, legendary warm vintage holographic metallurgy quality and low noise

carefully curated screened and twice tested 12at7 ecc81 pair

full amplificaton test balance match 106/105 ~ 106/105 % gm (65 % good)

our unique mutual gm output test applies 225 vdc simulating actual circuits plus filtered dc

simply put lower gm = more head room and tamer bass, higher gm = x gain / bass response

push pull setups and high end designs require < 10% triode match, lopsided = better for mono apps

+ life leak short gas checked, supplier double checked via tv7 for conductance and noise

all tubes also undergo a complimentary proprietary one of a kind master refurb process!

give 100+ hours at your specific amps voltage to fully cure due to long term hibernation

ships fast well packed worldwide, combined postage is available

~authentic vintage hifidelity audio curation by caliacoustics~