RCA 6SJ7 – SINGLE TUBE (1 PC)
Red Print
Black Metal Can
Made in USA
Sharp-Cutoff Pentode 6SJ7 / 6SJ7GT / 5693
New in Original Box
Amplitrex AT1000 Tested
Up for sale is a single (1 pc) genuine vintage NOS RCA 6SJ7 sharp-cutoff pentode vacuum tube, manufactured in the USA and complete with its original RCA Radiotron red box. Constructed with a durable black metal envelope featuring classic red lettering, this metal-can tube provides complete 360-degree electromagnetic and RF shielding for ultra-low noise floor performance, minimal microphonics, and long-term stability. An exceptional choice for vintage audio preamplifiers, high-end microphone preamps, and classic instrument amplifiers taking 6SJ7 series tubes.
This tube has 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:5440001 | Single Pentode | 3.0 mA | 3.3 mA | 110% | 1600 | 1700 | 106% |
Technical Note: Custom duties and taxes are the responsibility of the buyer in their country.
Reviews
There are no reviews yet