Siemens
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Product Summary
Model: 1960 Siemens Valvo Hamburg EF86 6267 Mesh Plates (Made in Germany)
Soundlumia Tube Sound Rating: 9.0/10 - Excellent
1960s Hamburg production - The real King of Bass - Unparalleled musicality with great substance and weight in midrange presentation
Date codes: 8Y2 D0D (8Y2 = EF86 production gen #2, D = Hamburg, 0 = 1960, D = April)
GM (Mutual Conductance) test result: 107%/92% NOS
Silkscreen: 95% - 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): 2.14 mA/V - 107% (100% = 2.0 mA/V)
Measured plate current (IA): 3.062 mA - 102% (100% = 3.0 mA)
Tube 2:
Measured transconductance (GM): 1.84 mA/V - 92% (100% = 2.0 mA/V)
Measured plate current (IA): 2.627mA - 88% (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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