TELEFUNKEN EF89 — Matched Quad
Grade: NOS (New Old Stock)
Laboratory Verified
Made in Germany
Laboratory Verified
Made in Germany
Diamond Base Logo
Original Telefunken Shield
Internal Shielding
Precision Amplitrex AT1000 Tested
Original Telefunken Shield
Internal Shielding
Precision Amplitrex AT1000 Tested
Presenting a world-class Matched Quartet of Telefunken EF89 pentodes, meticulously manufactured in Germany. These are highly sought-after New Old Stock (NOS) specimens, featuring the legendary Telefunken shield logo and robust internal construction designed for exceptional longevity and low-noise performance.
This quartet has been laboratory-verified on the Amplitrex AT1000 to ensure tight matching of both plate current ($I_a$) and mutual conductance ($G_m$). Ideal for high-fidelity radio frequency stages and sensitive audio circuits where German precision is required.
| Serial No. | Parameter Ia (mA) | Result Ia (mA) | % Ia | Parameter S (mA/V) | Result S (mA/V) | % S |
|---|---|---|---|---|---|---|
| #5314002 | 6.0 | 5.0 | 83.3% | 3.6 | 3.10 | 86.1% |
| #5314003 | 6.0 | 6.4 | 106.6% | 3.6 | 2.90 | 80.5% |
| #5314001 | 6.0 | 7.2 | 120.0% | 3.6 | 3.20 | 88.8% |
| #5314004 | 6.0 | 7.6 | 126.6% | 3.6 | 3.30 | 91.6% |
Note: Custom duties and taxes are the responsibility of the buyer in their country.
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Genuine Telefunken Germany — NOS Audio Tubes
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