Siemens ECC81 (12AT7) NOS Matched Pair
NOS Matched Pair
New In White Box
Double Mica
Grey Plate
New In White Box
Double Mica
Grey Plate
Offering a laboratory-matched pair of 2 pcs Siemens ECC81 (12AT7) dual triodes, Serial Nos. 2939006 and 2939011. These premium German-manufactured valves feature high-stability Grey Plates, Double Mica construction, and a Top Ring Getter. Both tubes are New Old Stock (NOS) in clean white boxes and have been fully characterized on the Amplitrex AT1000 Digital Tube Tester.
- Type: ECC81 / 12AT7 Brand: Siemens
- Condition: NOS in White Boxes Construction: Double Mica / Top Ring Getter
- Origin: Made in Germany Testing: Amplitrex AT1000
High-Emission Screening: These tubes demonstrate strong mutual conductance (uMhos) across all triode sections.
Precision Characterization: Both units have been screened for balanced performance against reference parameters (Ip=10.0, Gm=5500), making them ideal for high-fidelity audio applications.
Precision Characterization: Both units have been screened for balanced performance against reference parameters (Ip=10.0, Gm=5500), making them ideal for high-fidelity audio applications.
⚠️ International Buyers: Custom duties and taxes are the responsibility of the buyer in their country.
| Sr. No. | Test Triode | Parameter Ip (mA) | Result Ip (mA) | Percentage Ip | Parameter Gm (uMhos) | Result Gm (uMhos) | Percentage Gm |
|---|---|---|---|---|---|---|---|
| 2939006 | T1 | 10.0 | 9.2 | 92% | 5500 | 5100 | 93% |
| T2 | 10.0 | 8.4 | 84% | 5500 | 4800 | 87% | |
| 2939011 | T1 | 10.0 | 9.9 | 99% | 5500 | 5200 | 95% |
| T2 | 10.0 | 10.4 | 104% | 5500 | 5400 | 98% |
✉️ For technical inquiries, please Email us at [email protected]
Whatsapp: +1 (630) 597-3966
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