MULLARD 7308 / CV4108 / E88CC – MATCHED QUAD (4 PCS)
Gold Pins
Top Solid Disc Getter
Grey Plate
Made in UK
Special Quality 7308 / CV4108 / E88CC / 6922
New in White Box
Amplitrex AT1000 Tested
Up for sale is a matched quad set (4 pcs) of ultra-premium vintage NOS Mullard 7308 / CV4108 / E88CC dual triode vacuum tubes, manufactured in the UK and supplied in individual white boxes. Featuring heavy gold-plated pins, durable grey plate structures, and top solid disc getters, the 7308 / CV4108 is the pinnacle military-grade, long-life, low-noise reference standard in the 6922 / E88CC / 6DJ8 family. Revered by audiophiles for its rich harmonic texture, transparent top end, deep bass impact, and whisper-quiet operation. An incredible set for high-end preamplifiers, DAC buffer stages, and headphone amplifiers requiring a complete matched quad.
All four tubes have been fully tested on a precision Amplitrex AT1000 tube tester. Measured Plate Current (Ip in mA) and Mutual Conductance (uMhos) alongside percentage performance ratings relative to nominal factory reference specs (Reference: 15.0 mA / 12,500 uMhos) are detailed in the table below.
| Serial No. | Triode Section | Plate Current (Ip) | Mutual Conductance (uMhos) | ||||
|---|---|---|---|---|---|---|---|
| Ref Spec | Result | % Ip | Ref Spec | Result | % uMhos | ||
| SR.NO. 221133 | Triode 1 | 15.0 mA | 9.4 mA | 63% | 12500 | 11040 | 88% |
| Triode 2 | 15.0 mA | 9.8 mA | 65% | 12500 | 11130 | 89% | |
| SR.NO. 221013 | Triode 1 | 15.0 mA | 14.4 mA | 96% | 12500 | 11210 | 90% |
| Triode 2 | 15.0 mA | 14.9 mA | 99% | 12500 | 11530 | 92% | |
| SR.NO. 221028 | Triode 1 | 15.0 mA | 11.2 mA | 75% | 12500 | 11030 | 88% |
| Triode 2 | 15.0 mA | 10.4 mA | 69% | 12500 | 11310 | 90% | |
| SR.NO. 221006 | Triode 1 | 15.0 mA | 13.0 mA | 87% | 12500 | 11270 | 90% |
| Triode 2 | 15.0 mA | 13.4 mA | 89% | 12500 | 11040 | 88% | |
Technical Note: Custom duties and taxes are the responsibility of the buyer in their country.
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