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

this old school legendary carbide black coating radiates heat, reduces plate temps, + enhances tonal breakup characteristics

neat and sweet w/ no loss of complex detail, a liquid juicy vibe, w/ great extended response, and incredible bass transparency
often compared to mullard, brimar bva have more frequency depth, improved vocal sexiness, + a rich warm luminous resolve
featuring tweedy yet crisp articulation, vinyl-style intimate acoustics, resolving instrumentals, and great percussion definition

the colorful lush even/odd harmonics, and expansive dimensional frequency bloom, all contribute to brimars collectible lore


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

a special tube not only for its sound, the cv4068 6158 is a rare limited run sq version of the legendary sought after 13d3/13d5

performing 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/ authentic etch code

carefully curated classic! w/ nice silkscreen, and plain or branded box included


full mutual conductance test, nos w/ pristine balance: +2,000/2,000 gm mmhs + leak/short/gas/life/sound checks
our high power output test applies 250v w/ filtered dc, simulates real circuits, measuring the entire linear curve (ep-ig)
+ undergoes a proprietary 10-step refurbish process, a complimentary one of a kind value-added quality control

give several sessions (up to 150+ hours) w/ your amps voltage to fully break-in, cure, and open up sonically
ships well packed worldwide! priority/express by request