RCA 6SN7GTB – SINGLE TUBE
GRADE: GOLD SERIES | VINTAGE AMERICAN MEDIUM-MU DUAL TRIODE
RCA (Radio Corporation of America)
6SN7GTB Medium-Mu Dual Triode
Side Ring Getter
Black Plates
Coin Base
New in White Box
Amplitrex AT1000 Tested
Up for sale is a single piece (1 PC) of vintage NOS RCA 6SN7GTB dual triode vacuum tube, packaged in a white box. Manufactured in the USA, this high-grade audio tube features black plates, a space-saving coin base, and a side ring getter assembly. Renowned by audiophiles for RCA’s classic smooth response, organic midrange detail, solid low-end control, and quiet performance in Hi-Fi preamplifiers, driver stages, and line amplifiers.
As shown, the tube has been thoroughly tested on an advanced Amplitrex AT1000 tube testing system in full fixed-bias mode, testing stable across both triode sections. Plate current (Ip) and mutual conductance (Gm) measurements alongside percentage performance ratings relative to nominal factory specs are detailed in the table below.
| Serial No. | Triode Section | Plate Current (Ip) | Transconductance (Gm) | ||||
|---|---|---|---|---|---|---|---|
| Ref Spec | Result | % Ip | Ref Spec | Result | % Gm | ||
| SR.NO. 1869001 | Triode 1 (T1) | 9.0 mA | 6.6 mA | 73% | 2600 µMhos | 1800 µMhos | 69% |
| Triode 2 (T2) | 9.0 mA | 7.2 mA | 80% | 2600 µMhos | 2000 µMhos | 77% | |
Technical Note: Custom duties and taxes are the responsibility of the buyer in their country.
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