NOS Brimar 13D5 LongPlate GtBritain ~ RarePremium 12AU7 ECC82 + OEBox ~ Layered Detailed Warm Vintage HiFi

we pride ourselves on a proprietary complimentary value-added complete refurb screen and deox process

old stock brimar gt britain 13d5, these are rare premium 12au7 ecc82 collectibles

very rare long plate edition! incredible sound stage clean top end w/ rich warm mids

revered worldwide by audiophiles, often compared to mullard, similar to cv4003 w/ more layers of delicate detail

1l1 / 1671 authentic british etch code  w/ oe box included, carefully curated and twice tested direct import

full conductance test nos % mutual gm (65%)+ life test pass! (life check = key longetivity indicator)

our special gm output test applies real world 225vdc voltages w/ filtered dc, plus an impeccable gas test and leak/short check

gm scores relate to current-transfer ability, whereas gain relates to signal amplification ~ a subtle difference based on actual voltages

give several sessions or up to 100+ hours w/ your specific amps voltage to fully cure (break-in is important)

ships well packed worldwide ~ authentic vintage hifidelity audio curation