ZAERIX 6SJ7 – MATCHED PAIR (2 PCS)
Black Metal Tube
Made in Russia
Sharp-Cutoff Pentode 6SJ7 / 6SJ7GT / 5693
New in Original Box
Amplitrex AT1000 Tested
Up for sale is a matched pair (2 pcs) of vintage NOS Zaerix 6SJ7 sharp-cutoff pentode vacuum tubes, manufactured in Russia and custom-labeled for Zaerix (Z & I Aero Services Ltd, London), supplied in their original green branded boxes. Built with robust black metal can enclosures that provide complete 360-degree RF and electro-magnetic shielding, these tubes are highly valued for low-noise audio amplification and long-term durability. An ideal replacement pair for vintage tube preamplifiers, microphone preamps, and classic instrument amplifiers taking 6SJ7 / 6SJ7GT / 5693 series tubes.
Both 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: 3.0 mA / 1,600 uMhos) are detailed in the table below.
| Serial No. | Tube Section | Plate Current (Ip) | Mutual Conductance (uMhos) | ||||
|---|---|---|---|---|---|---|---|
| Reference / Result | Ref Spec | Result | % Ip | Ref Spec | Result | % uMhos | |
| SR.NO.5428001 | Single Pentode | 3.0 mA | 3.0 mA | 100% | 1600 | 1600 | 100% |
| SR.NO.5428003 | Single Pentode | 3.0 mA | 2.9 mA | 97% | 1600 | 1600 | 100% |
Technical Note: Custom duties and taxes are the responsibility of the buyer in their country.
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