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Telefunken

Telefunken EF804S Matched Pair - ◇ Bottom - Ulm 1962/1963 - Tested NOS

Telefunken EF804S Matched Pair - ◇ Bottom - Ulm 1962/1963 - Tested NOS

$284.00 USD
$284.00 USD
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Product Summary

Model: 1962/1963 Telefunken EF804S (Made in Germany)

Soundlumia Tube Sound Rating: 9.5/10 - Outstanding 

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

Date codes: 

U1102104G (U = Ulm, Germany, 2 = 1962) 

U0203804a (U = Ulm, Germany, 3 = 1963) 


GM (Mutual Conductance) test result: 106%/95% of NOS/NEW

Silkscreen: 90% - 100%

Packaging: 

NEW reproduction Telefunken tube boxes.


Professional Tube Testing


Tube 1:

Measured transconductance(GM): 2.11 mA/V - 106% (100% = 2.00 mA/V)
Measured plate current(IA): 3.527 mA  - 118% (100% = 3 mA)

Tube 2:

Measured transconductance(GM): 1.9 mA/V - 95% (100% = 2.00 mA/V)
Measured plate current(IA): 2.71 mA  - 90% (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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