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Valvo

Valvo EF86 6267 Mesh Plates D-getter Matched Pair - Hamburg 1957 8Y1 - Used

Valvo EF86 6267 Mesh Plates D-getter Matched Pair - Hamburg 1957 8Y1 - Used

Regular price $108.00 USD
Regular price Sale price $108.00 USD
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Product Summary

Model: 1957 Valvo Hamburg EF86 6267 Mesh Plates (Made in Germany)

Soundlumia Tube Sound Rating9.0/10 - Excellent

1950s Hamburg production - The real King of Bass - Unparalleled musicality with great substance and weight in midrange presentation

Date codes: 
8Y1 D7D (8Y1 = EF86 production gen #1, D = Hamburg, 7 = 1957, D = April)
8Y1 D7J (8Y1 = EF86 production gen #1, D = Hamburg, 7 = 1957, J = October)

GM (Mutual Conductance) test result: 47%/61% NOS

Silkscreen: 95% - 100%

Packaging: New white tube boxes.

Professional Tube Testing
Tube 1:

Measured transconductance(GM): 0.94 mA/V - 47% (100% = 2.00 mA/V)
Measured plate current(IA): 1.532 mA  - 51% (100% = 3 mA)

Tube 2:

Measured transconductance(GM): 1.22 mA/V - 61% (100% = 2.00 mA/V)
Measured plate current(IA): 1.765 mA  - 59% (100% = 3 mA)

NO shorts, leakage or gas. NO noise or microphonics.

Curve trace is also included in the original RoeTest report.
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