STC 6J7G – MATCHED Pair TUBE (2 PCS)
Bottom Leaf Getter
Classic Black Base
Top Grid Cap Connection
ST Shoulder Glass Shape
Sharp-Cutoff Audio Pentode 6J7G
New in Original GVT Box
Amplitrex AT1000 Tested
Up for sale is a matched pair (2 pcs) of vintage NOS STC 6J7G sharp-cutoff audio pentode vacuum tubes, complete with their original GVT factory boxes. Manufactured by Standard Telephones & Cables (STC), these classic British valves feature bottom leaf getters, sturdy black octal bases, top grid cap connectors, internal mesh shield structures, and traditional ST shoulder glass envelopes. Renowned for ultra-low noise floor, excellent microphonic resistance, rich midrange texture, and high signal purity in low-level amplification circuits. A premium matched pair upgrade or replacement for vintage audio preamplifiers, microphone preamps, and classic tube gear using 6J7G / 6J7 valves.
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: 2.0 mA / 1,200 uMhos) are detailed in the table below.
| Serial No. | Tube Section | Plate Current (Ip) | Mutual Conductance (uMhos) | ||||
|---|---|---|---|---|---|---|---|
| Ref Spec | Result | % Ip | Ref Spec | Result | % uMhos | ||
| SR.NO.788043 | Single Pentode | 2.0 mA | 2.1 mA | 105% | 1200 | 1000 | 83% |
| SR.NO.788049 | Single Pentode | 2.0 mA | 1.7 mA | 85% | 1200 | 1000 | 83% |
Technical Note: Custom duties and taxes are the responsibility of the buyer in their country.
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