RCA 6N7 — Premium Matched Quad 4 Pcs
Laboratory Verified
Made in U.S.A.
New in Original Box
Date Code: 6-29A
Amplitrex AT1000 Tested
Available for purchase is a rare matched quad (4 Pcs) of RCA 6N7 metal envelope dual triodes, Made in the U.S.A.. These iconic “Radiotron” units are finished in the original black metal casing, providing superior electromagnetic shielding for high-gain audio applications.
All four valves are in New Old Stock condition, bearing the 6-29A date code. They have been laboratory-verified on the Amplitrex AT1000 using industrial standards. Percentages are calculated against the official factory specifications for the 6N7 (Ip = 3.0 mAdc / Gm = 1600 µMhos).
| Serial No. | Test Triode | Parameter Ip mAdc | Result Ip mAdc | % Ip | Parameter Gm uMhos | Result Gm uMhos | % Gm |
|---|---|---|---|---|---|---|---|
| 2911002 | T1 | 3.0 | 2.8 | 93% | 1600 | 1500 | 94% |
| T2 | 3.0 | 2.8 | 93% | 1600 | 1500 | 94% | |
| 2911006 | T1 | 3.0 | 3.0 | 100% | 1600 | 1500 | 94% |
| T2 | 3.0 | 2.8 | 93% | 1600 | 1500 | 94% | |
| 2911001 | T1 | 3.0 | 2.9 | 97% | 1600 | 1400 | 88% |
| T2 | 3.0 | 3.0 | 100% | 1600 | 1500 | 94% | |
| 2911003 | T1 | 3.0 | 2.9 | 97% | 1600 | 1500 | 94% |
| T2 | 3.0 | 3.1 | 103% | 1600 | 1500 | 94% |
About NOS Audio Tubes
Based in Mumbai, India, we are professional suppliers of high-quality vacuum tubes with a specialized history dating back to the 1970s. Managing an inventory of over 300,000 valves, we utilize industrial-grade Amplitrex AT1000 equipment to provide accurate, transparent test data for the global audiophile and restoration community.
Note: Custom duties and Taxes are the Responsibility of the Buyer in their Country
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