RAY TUBES SELECT-12AU7 / ECC82 – MATCHED PREAMP TUBE PAIR (2 PCS)
Top Ring Getter
Grey Plate Construction
Premium Golden Pins
Dual Triode SELECT-12AU7 / ECC82
New in Original Box
Amplitrex AT1000 Tested
Up for sale is a matched pair (2 pcs) of high-performance Ray Tubes Select-12AU7 dual triode vacuum tubes, complete with their original factory boxes[cite: 14]. Built with precision grey plate structures, top ring getters, and corrosion-resistant golden pins for exceptional signal conductivity[cite: 14], Ray Tubes Select series are celebrated for superior microphonic resistance, rich tonal warmth, precise stereo separation, and extended frequency extension. An outstanding upgrade or replacement preamp tube for high-end audio preamplifiers, DAC buffer stages, and headphone amplifiers.
Both tubes have been fully tested on a precision Amplitrex AT1000 tube tester[cite: 14]. Measured Plate Current (Ip in mA) and Mutual Conductance (uMhos) alongside percentage performance ratings relative to nominal factory reference specs (Reference: 10.5 mA / 2,200 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.5484001 | Section 1 (T1) | 10.5 mA | 6.4 mA | 61% | 2200 | 2000 | 91% |
| Section 2 (T2) | 10.5 mA | 8.2 mA | 78% | 2200 | 2700 | 123% | |
| SR.NO.5484002 | Section 1 (T1) | 10.5 mA | 8.7 mA | 83% | 2200 | 2960 | 135% |
| Section 2 (T2) | 10.5 mA | 8.4 mA | 80% | 2200 | 2500 | 114% | |
Technical Note: Custom duties and taxes are the responsibility of the buyer in their country.
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