1x NOS Rare Brimar Gt Britain 6158 CV4068 ~ Premium 13D3 ~ HighPower 12AU7 ECC82 Plugin / 12AY7 Sub ~ Grail Vintage British Warmth Layered Complex Musicality ~ Black Plate Open Tone

est. 1933, brimar bva was part of stc (similar to western electric) and a british valve assocation member, along w/ mullard/gec

often seen under the names ediswan, thorn, aei, and mazda, brimar are known for their cv (military grade) top echelon valves

a collectible audiophile darling, premium brimar gt britain cv series ~ a beautiful layered open tone, w/ black plate dynamics

often compared to mullard sound stages, brimar bva have improved tonal depth, more vocal sexiness, and a dynamic luminosity

the legendary carbide black coating radiates heat better, reduces plate temps, and enhances breakup / tonal characteristics

neat and sweet w/ no loss of complex detail, a liquid juicy vibe, w/ great extended response, and incredible bass transparency

featuring tweedy yet crisp vocal articulation, vinyl style intimate acoustics, resolving instrumentals, and percussion definition

the colorful lush warm harmonics, and expansive 3-dimensional frequency bloom, all contribute to brimars collectible lore

a special tube not only for its sound, the cv4068 6158 is a rare limited run sq version, of the legendary sought after 13d3

performs extremely well in 12au7 circuits ~ yet produces more gain (30 vs 17) and higher transconductance (2.5 vs 2.2)

1 x old stock special cv4068 6158 black plate brimar gt britain, w/ visible etch code and nice silkscreen, w/ box included

twice tested, audio grade + undergoes a complimentary refurbish and deoxit process ~ one of a kind value-added qc

full mutual conductance gm test + life test pass (key longetivity indicator) + leak / short / gas checkour high power output test applies up to 250v, more than many other testers, and simulates real circuits

give several sessions or 150+ hours w/ your amps voltage to fully break-in / cure

ships well packed