TORVAC CV591 / 6SJ7 – MATCHED PAIR (2 PCS)
Black Metal Tube
Sharp-Cutoff Pentode CV591 / 6SJ7
New in Original Box
Amplitrex AT1000 Tested
Up for sale is a matched pair (2 pcs) of genuine vintage NOS Torvac CV591 / 6SJ7 sharp-cutoff pentode vacuum tubes, complete with their original Torvac boxes. Constructed with durable black metal envelopes providing complete 360-degree electromagnetic and RF shielding, these metal-can tubes deliver ultra-low noise floor performance, minimal microphonics, and exceptional long-term operational stability. An outstanding choice for vintage audio preamplifiers, high-end microphone preamps, and classic radio or instrument equipment utilizing 6SJ7 / CV591 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: 3.0 mA / 1,600 uMhos) are detailed in the table below.
| Serial No. | Tube Section | Plate Current (Ip) | Mutual Conductance (uMhos) | ||||
|---|---|---|---|---|---|---|---|
| Reference / Result | Ref Spec | Result | % Ip | Ref Spec | Result | % uMhos | |
| SR.NO:5442001 | Single Pentode | 3.0 mA | 3.9 mA | 130% | 1600 | 1900 | 119% |
| SR.NO:5442002 | Single Pentode | 3.0 mA | 2.9 mA | 97% | 1600 | 1700 | 106% |
Technical Note: Custom duties and taxes are the responsibility of the buyer in their country.
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