STC 6J7G – SINGLE AUDIO PENTODE TUBE (1 PC)
Made in England
Metal Base Shell
Top Grid Cap Connection
ST Shoulder Glass Shape
Sharp-Cutoff Audio Pentode 6J7G
New in White Box
Amplitrex AT1000 Tested
Up for sale is a single (1 pc) vintage NOS STC 6J7G sharp-cutoff audio pentode vacuum tube, supplied in an individual white box[cite: 17]. Manufactured by Standard Telephones & Cables (STC) in England, this classic British valve features a heavy-duty metal base collar, top grid cap connector, internal mesh shield structure, and traditional ST shoulder glass envelope[cite: 17]. Renowned for an ultra-low noise floor, excellent microphonic suppression, rich midrange texture, and high signal purity in low-level amplification circuits. A premium replacement or upgrade for vintage audio preamplifiers, microphone preamps, and classic tube gear using 6J7G / 6J7 valves.
This tube has been fully tested on a precision Amplitrex AT1000 tube tester[cite: 17]. 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[cite: 17].
| Serial No. | Tube Section | Plate Current (Ip) | Mutual Conductance (uMhos) | ||||
|---|---|---|---|---|---|---|---|
| Ref Spec | Result | % Ip | Ref Spec | Result | % uMhos | ||
| SR.NO.1144005 | Single Pentode | 2.0 mA | 1.9 mA | 95% | 1200 | 1100 | 92% |
Technical Note: Custom duties and taxes are the responsibility of the buyer in their country.
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