Mullard ECC83 / 12AX7
LONG GREY PLATE | SQUARE GETTER | MADE IN GT. BRITAIN
Blackburn Plant
Long Grey Plate
Amplitrex AT1000
Available now are two exceptionally rare Mullard ECC83 vacuum tubes, featuring the coveted mC1 Square Getter and Long Grey Plate construction. Manufactured at the Blackburn plant in Great Britain, these late-1950s units are the “Holy Grail” for tone purists, offering the legendary warm, rich, and harmonically complex sound that Mullard is famous for.
Precision screened on our Amplitrex AT1000 Advance Digital Tester, the results below use the Percentage Method against original factory specs (Ip = 1.2 mA / Gm = 1600 µMhos).
| Serial No. | Date Code | Section | Param Ip | Result Ip | % Ip (Emission) | Param Gm | Result Gm | % Gm (Transc.) |
|---|---|---|---|---|---|---|---|---|
| #158025 | mC1 B7C | Triode 1 | 1.2 | 1.7 | 141.7% | 1600 | 1600 | 100.0% |
| Triode 2 | 1.2 | 2.1 | 175.0% | 1600 | 1800 | 112.5% | ||
| #1190002 | mC1 B5L | Triode 1 | 1.2 | 0.7 | 58.3% | 1600 | 1200 | 75.0% |
| Triode 2 | 1.2 | 0.7 | 58.3% | 1600 | 1100 | 68.8% |
⚠️ 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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