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Telefunken

Telefunken EF86 6267 O-getter Matched Pair - Diamond Bottom - Ulm 1958/59 - NOS

Telefunken EF86 6267 O-getter Matched Pair - Diamond Bottom - Ulm 1958/59 - NOS

$287.50 USD
$287.50 USD
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Product Summary

Model: 1958/59 Telefunken EF86 6267 O-getter (Made in Germany)

Soundlumia Tube Sound Rating: 9.5/10 - Outstanding 

Early 1950s Ulm, Germany production - Unparalleled sound characteristics and superb build quality - True holographic sound stage with layered details and ultra clarity

Date code: 
U6108901 (U = Ulm, Germany, 8 = 1958)
U7009402 (U = Ulm, Germany, 9 = 1959)
 
GM (Mutual Conductance) test result: 107%/111% 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): 2.13 mA/V  - 107%  (100% = 2.0 mA/V)
Measured plate current (IA): 3.085 mA  - 103%  (100% = 3.0 mA)

Tube 2: 

Measured transconductance (GM): 2.21 mA/V  - 111%  (100% = 2.0 mA/V)
Measured plate current (IA): 3.205 mA  - 107%  (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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