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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
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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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