Mullard ECC83 / 12AX7
MATCHED PAIR | GREAT BRITAIN | TOP RING GETTER
Blackburn Plant (B)
Top Ring Getter
Amplitrex Tested
Up for sale is a premium matched pair of vintage Mullard ECC83 preamp tubes. These units were manufactured at the legendary Blackburn plant in Great Britain, identified by the early 1964 date codes (B4K). Featuring the Top Ring Getter, Mullard tubes are world-famous for their lush, warm midrange and detailed harmonic response.
Precision screened on our Amplitrex AT1000 digital laboratory tester, the results below utilize the Percentage Method against original factory design-center specifications (Ip = 1.2 mA / Gm = 1600 µMhos). This pair has been hand-selected for excellent triode-to-triode balance.
| Serial No. | Date Code | Section | Param Ip | Result Ip | % Ip (Emission) | Param Gm | Result Gm | % Gm (Transc.) |
|---|---|---|---|---|---|---|---|---|
| #1667073 | B4K3 | Triode 1 | 1.2 | 1.3 | 108.3% | 1600 | 1600 | 100.0% |
| Triode 2 | 1.2 | 1.0 | 83.3% | 1600 | 1500 | 93.8% | ||
| #1686139 | B4K9 | Triode 1 | 1.2 | 1.1 | 91.7% | 1600 | 1600 | 100.0% |
| Triode 2 | 1.2 | 1.1 | 91.7% | 1600 | 1500 | 93.8% |
⚠️ International Buyers: Custom duties and taxes are the responsibility of the buyer. Please confirm your order if you are in an extended delivery area.
NOS AUDIO TUBES
Specialized screening since 1970 | 300,000+ Tubes in Stock
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