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Telefunken

2x Telefunken EF86 6267 Silver Plates - ◇ Bottom - Ulm 1964 - Same Code - NOS

2x Telefunken EF86 6267 Silver Plates - ◇ Bottom - Ulm 1964 - Same Code - NOS

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Product Summary

Model: 1964 Telefunken EF86 6267 (Made in Germany)

Soundlumia Tube Sound Rating9.5/10 - Outstanding 

Early 1960s Ulm, Germany production - Unparalleled sound characteristics and superb build quality - True holographic sound stage with layered details and ultra clarity

Date code: U 7004206 (U = Ulm, 4 = 1964)
 
GM (Mutual Conductance) test result92%/112% NOS

Silkscreen: 100%

PackagingNEW white tube boxes.

 

Professional Tube Testing

This set was tested and certified by RoeTest V11 Professional Tube Testing System with the following result: 

Tube 1:

Measured transconductance(GM): 1.83 mA/V - 92% (100% = 2.00 mA/V)
Measured plate current(IA): 3.047 mA  - 102% (100% = 3 mA)

Tube 2:

Measured transconductance(GM): 2.24 mA/V - 112% (100% = 2.00 mA/V)
Measured plate current(IA): 3.01 mA  - 100% (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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