Mullard
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Product Summary
Model: Mullard EF86 6267 (Made in United Kingdom)
Soundlumia Tube Sound Rating: 9.0/10 - Outstanding
Lush and warm vintage tone, intimate vocals, wide sound stage with layered details
Date code(s): 9r1 B8B (9r = EF86 long plates, B = Blackburn, 8 = 1958, B = February)
GM (Mutual Conductance) test result: 100%/105% NOS
Silkscreen: 100%
Packaging: NEW white tube boxes
Professional Tube Testing
This set was tested and certified by RoeTest V11 tester with the following result:
Tube 1:
Measured transconductance (GM): 1.55 mA/V - 78% (100% = 2.0 mA/V)
Measured plate current (IA): 2.282 mA - 76% (100% = 3.0 mA)
NO shorts, leakage or gas. NO noise or microphonics.
Curve trace is also included in the original RoeTest report.
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