RCA 6F8G NOS NIB Single Piece
Made in USA
Classic Black Base
Vintage Date Code: S4
Amplitrex AT1000 Tested
Up for sale is a single piece (1 Pcs) of a premium, New Old Stock (NOS) RCA 6F8G twin triode vacuum tube. Widely recognized as the sonically superior octal precursor to the legendary 6SN7, the 6F8G is highly coveted by audiophiles and custom amplifier builders for its rich harmonic texture, deep soundstage, and ultra-transparent micro-dynamics.
This tube is in immaculate, unused condition and comes preserved in a clean, new white box. It features a solid Black Base cleanly stamped with the vintage factory date code S4, a top grid cap, and the iconic protective Black Coated Glass shield envelope designed by RCA to minimize external RF interference and hum in critical low-level preamplifier stages.
| Tube Position / Serial No. | Target Ip mAdc (Ia) | Result Ip mAdc (Ia) | % Ip (Ia) | Target Gm uMhos (mA/V) | Result Gm uMhos (mA/V) | % Gm (mA/V) |
|---|---|---|---|---|---|---|
| — Section 1 | 9 | 9.2 | 102.2% | 2600 | 2900 | 111.53% |
| — Section 2 | 9 | 9.2 | 102.2% | 2600 | 2900 | 111.53% |
About NOS Audio Tubes
We are professional suppliers of high-quality vacuum tubes with a specialized industry lineage dating back to the 1970s. Maintaining a vast global reserve of nearly 300,000 pristine valves, we focus on high-fidelity audio equipment and vintage instrumentation. Every tube is verified utilizing premium testing gear like the Amplitrex AT1000 to offer our global community reliable, transparent grading.
Note: Custom duties and Taxes are the Responsibility of the Buyer in their Country.
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NOS Audio Tubes — Mumbai, India
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