Mullard ECC83 / 12AX7
MATCHED QUAD (4 PCS) | MADE IN GT. BRITAIN | SHORT PLATE
Genuine Mullard Gt. Britain
Short Plate / Ring Getter
Matched Quad Set
Amplitrex AT1000 Verified
Short Plate / Ring Getter
Matched Quad Set
Amplitrex AT1000 Verified
Up for sale is a world-class matched quad of vintage Mullard ECC83 tubes, Made in Great Britain. These feature the iconic Short Plate construction and Ring Getter. Known globally for their warm, rich tonal character, these are the definitive choice for premium audio applications.
This quad has been precision tested on the Amplitrex AT1000. The data below is calculated using the Percentage Method against original factory design-center specifications (Ip = 1.2 mA / Gm = 1600 µMhos).
| Serial No. | Section | Parameter Ip | Result Ip | % Ip | Parameter Gm | Result Gm | % Gm |
|---|---|---|---|---|---|---|---|
| #1705504 | Triode 1 | 1.2 | 2.5 | 208.3% | 1600 | 1600 | 100.0% |
| Triode 2 | 1.2 | 2.1 | 175.0% | 1600 | 1500 | 93.7% | |
| #1705574 | Triode 1 | 1.2 | 2.6 | 216.6% | 1600 | 1600 | 100.0% |
| Triode 2 | 1.2 | 2.3 | 191.6% | 1600 | 1500 | 93.7% | |
| #1705257 | Triode 1 | 1.2 | 2.8 | 233.3% | 1600 | 1600 | 100.0% |
| Triode 2 | 1.2 | 2.7 | 225.0% | 1600 | 1500 | 93.7% | |
| #1705031 | Triode 1 | 1.2 | 2.8 | 233.3% | 1600 | 1600 | 100.0% |
| Triode 2 | 1.2 | 2.4 | 200.0% | 1600 | 1500 | 93.7% |
Note: Custom duties/taxes are the buyer’s responsibility. Remote area surcharges may apply—please confirm before checkout.
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