Philips ECC83 / 12AX7 — Matched Pair Vintage Black Plates
Laboratory Verified
Top Ring Getter
Made in Holland
Amplitrex AT1000 Verified
Up for sale is a matched pair (2 pieces) of premium Philips ECC83 / 12AX7 vintage vacuum tubes. This set features the highly sought-after Black Plate internal structure and Top Ring Getter, hallmarks of mid-century Dutch tube manufacturing excellence.
Both units have been professionally screened on an Amplitrex AT1000. These tubes exhibit high emission and mutual conductance (Gm) levels, qualifying them for our Gold Grade designation, ideal for high-end phono stages and preamplifiers.
| Serial No. | Test Triode | Parameter Ip mAdc | Result Ip mAdc | % Ip | Parameter Gm uMhos | Result Gm uMhos | % Gm |
|---|---|---|---|---|---|---|---|
| 1181013 | T1 | 1.2 | 1.0 | 83.3% | 1600 | 1600 | 100.0% |
| T2 | 1.2 | 1.1 | 91.6% | 1600 | 1700 | 106.2% | |
| 1181014 | T1 | 1.2 | 1.3 | 108.3% | 1600 | 1580 | 98.7% |
| T2 | 1.2 | 1.4 | 116.6% | 1600 | 1610 | 100.6% |
Technical Note: Percentage values are calculated against original factory NOS (New Old Stock) specifications: 1.2mA for Plate Current (Ip) and 1600 uMhos for Mutual Conductance (Gm).
Note: Custom duties and taxes are the responsibility of the buyer in their country.
Precision Verified — NOS Audio Tubes
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