Brimar CV133 (6C4/ EC90) 1960s Military Grade Vacuum Tube

Brimar CV133 tubes were manufactured in England during the early 1960s as a British military version of the 6C4 / EC90 miniature single triode. Brimar tubes from this period emphasize ruggedized valves for communications, instrumentation, and defense applications. They feature black plates, ring getters, and military-grade construction. Each tube has been screened and strictly matched on an Amplitrex AT1000 digital laboratory system.

Archive Assessed, Apos Assured

All Archive tubes are thoroughly tested, inspected, photographed, and inventoried, guaranteeing the quality of each tube that's shipped to customers. All tubes carry an Apos 12-month warranty against manufacturing defects.

Are the tubes...dusty...?

Because these are genuine New Old Stock tubes, small cosmetic irregularities may be present. These aren't defects but artifacts of vintage manufacturing and decades of storage. They have no impact on reliability or sonic performance.

Specs

• Brand / Type: Brimar CV133 / 6C4 / EC90
• Plate Type: Black
• Getter Type: Ring Getter
• Military Grade: Yes
• Made in: England
• Box Type: NOS in Original Box
• Tested on: Amplitrex AT1000 Advanced Digital Tube Tester