Telefunken ECC82 / 12AU7
DIAMOND BOTTOM | LONG PLAIN PLATE | MADE IN GERMANY | MATCHED QUAD
Germany Made
Diamond Bottom
Long Plain Plate
Up for sale is a world-class matched quad (4 pieces) of Telefunken ECC82 vacuum tubes. These are genuine New Old Stock (NOS) units, featuring the legendary Diamond Bottom mark and Long Plain Plates. Telefunken’s German-made ECC82 series is the definitive choice for audiophiles who demand absolute transparency and a precise, three-dimensional soundstage.
Precision tested on our Amplitrex AT1000 digital laboratory system, the results below utilize the Percentage Method against original factory design-center specifications (Ip = 10.5 mA / Gm = 2200 µMhos). This quad is exceptionally healthy, with one tube testing well into the 110%+ “Super Tube” range.
| Serial No. | Test Triode – T1/T2 | Parameter ip mAdc | Result ip mAdc | % Ip (Emission) | Parameter Gm uMhos | Result Gm uMhos | % Gm (Transc.) |
|---|---|---|---|---|---|---|---|
| #2338001 | Triode 1 | 10.5 | 9.2 | 87.6% | 2200 | 1970 | 89.5% |
| Triode 2 | 10.5 | 9.0 | 85.7% | 2200 | 1910 | 86.8% | |
| #2338003 | Triode 1 | 10.5 | 11.0 | 104.8% | 2200 | 2300 | 104.5% |
| Triode 2 | 10.5 | 9.2 | 87.6% | 2200 | 2100 | 95.5% | |
| #2338006 | Triode 1 | 10.5 | 9.8 | 93.3% | 2200 | 2100 | 95.5% |
| Triode 2 | 10.5 | 9.6 | 91.4% | 2200 | 2100 | 95.5% | |
| #2338019 | Triode 1 | 10.5 | 12.0 | 114.3% | 2200 | 2600 | 118.2% |
| Triode 2 | 10.5 | 11.8 | 112.4% | 2200 | 2500 | 113.6% |
⚠️ International Buyers: Custom duties and taxes are the responsibility of the buyer in their country.
Note: Extended area surcharges may apply for remote addresses; please confirm before checkout.
Quality Verified Since 1970
Specializing in thoroughly tested and screened quality vacuum tubes.
Testing equipment includes Amplitrex AT1000, Hickok 752a, and AVO Type 160.
Custom duties and taxes are the responsibility of the buyer in their country.
Support: [email protected] Precision Verified — NOS Audio Tubes
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