RCA 6201 / 12AT7 / ECC81 – MATCHED PAIR (2 PCS)
Top Ring Getter
Black Plate
Made in USA
High-Reliability 6201 / 12AT7 / ECC81New in Original Box
Amplitrex AT1000 Tested
Up for sale is a matched pair (2 pcs) of genuine vintage NOS RCA 6201 dual triode vacuum tubes, manufactured in the USA and complete with their original RCA Radiotron boxes. Built with robust black plate structures and top ring getters, the 6201 is the premium, long-life, low-noise industrial/military equivalent to the standard 12AT7 / ECC81 family. Renowned for exceptional linearity, low microphonics, and lush American tone, these tubes make an incredible upgrade for high-end audio preamplifiers, line stages, and studio equipment taking 12AT7 series tubes.
Both tubes have 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: 10.0 mA / 5,500 uMhos) are detailed in the table below.
| Serial No. | Triode Section | Plate Current (Ip) | Mutual Conductance (uMhos) | ||||
|---|---|---|---|---|---|---|---|
| Ref Spec | Result | % Ip | Ref Spec | Result | % uMhos | ||
| SR.NO.5445001 | Triode 1 | 10.0 m | 5.8 mA | 58% | 5500 | 4040 | 73% |
| Triode 2 | 10.0 mA | 8.4 mA | 84% | 5500 | 5320 | 97% | |
| SR.NO.5445002 | Triode 1 | 10.0 mA | 6.4 mA | 64% | 5500 | 4370 | 79% |
| Triode 2 | 10.0 mA | 8.1 mA | 81% | 5500 | 5110 | 93% | |
Technical Note: Custom duties and taxes are the responsibility of the buyer in their country.
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