National 12AU7A / ECC82
GREY PLATE | SMALL RING GETTER | MADE IN GERMANY | NOS SINGLE
German Production
Grey Plate
Amplitrex AT1000
Up for sale is a premium vintage National 12AU7A / ECC82, manufactured in Germany. This NOS unit features the sought-after German construction with a Grey Plate and Small Ring Getter, highly regarded for maintaining an exceptionally low noise floor and clean, transparent audio reproduction.
Precision tested on the Amplitrex AT1000 digital laboratory tester, the results below utilize the Percentage Method against original factory design-center specifications (Ip = 10.5 mA / Gm = 2200 µMhos). This tube shows strong emission and excellent laboratory-grade stability.
| Serial No. | Test Triode – T1/T2 | Parameter ip mAdc | Result ip mAdc | % Ip (Emission) | Parameter Gm uMhos | Result Gm uMhos | % Gm (Transc.) |
|---|---|---|---|---|---|---|---|
| #2171001 | Triode 1 | 10.5 | 10.2 | 97.1% | 2200 | 2100 | 95.4% |
| Triode 2 | 10.5 | 11.4 | 108.6% | 2200 | 1960 | 89.1% |
⚠️ International Buyers: Custom duties and taxes are the responsibility of the buyer in their country.
Custom duties and taxes are the responsibility of the buyer in their country.
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