6H9C / 6N9S (6SL7 Equivalent) — Matched Pair Performance
Grade: PLATINIUM Series
Laboratory Verified
Full Laboratory Test
Laboratory Verified
Full Laboratory Test
Up for sale is a meticulously matched set of two (2) premium 6H9C (6N9S) high-mu double triodes. These tubes are the high-fidelity Soviet equivalent to the Western 6SL7, featuring rugged construction and exceptional sonic detail.
Each tube has been independently analyzed on the Amplitrex AT1000. We have provided the specific transconductance (Gm) and plate current (Ip) results for all four triode sections below to confirm tight matching across the pair.
| Tube Serial | Test Triode | Parameter Ip mAdc | Result Ip mAdc | % Ip | Parameter Gm uMhos | Result Gm uMhos | % Gm |
|---|---|---|---|---|---|---|---|
| 2896051 | T1 | 2.3 | 2.7 | 117.39% | 1600 | 1900 | 118.75% |
| T2 | 2.3 | 2.6 | 113.04% | 1600 | 1900 | 118.75% | |
| 2896083 | T1 | 2.3 | 2.7 | 117.39% | 1600 | 1900 | 118.75% |
| T2 | 2.3 | 2.7 | 117.39% | 1600 | 1900 | 118.75% |
Technical Note: Percentage calculations are based on standard factory ratings for the 6H9C (2.3mA Ip / 1600 uMhos Gm). These tubes exhibit superior matching across all four triode sections, ensuring perfect channel balance.
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