KEN-RAD 7193 / CV6 – MATCHED QUAD (4 PCS)
Top Cap
Black Plate
Black Base
Made in USA
New in Original GVT Box
Amplitrex AT1000 Tested
Up for sale is a matched quad (4 pcs) of genuine vintage NOS Ken-Rad 7193 / CV6 medium-mu triode vacuum tubes, manufactured in the USA and supplied in their original military GVT boxes. Featuring rugged black plate structures, sturdy black bases, and top plate cap connections, the 7193 is celebrated for exceptional linearity and high-frequency performance. Highly sought after by audiophiles and vintage builders for multi-tube headphone amplifiers, balanced line stages, and specialized vintage audio circuits utilizing top-cap triodes.
All four 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: 9.0 mA / 2,600 uMhos) are detailed in the table below.
| Serial No. | Tube Section | Ref Ip | Result Ip | % Ip | Ref uMhos | Result uMhos | % uMhos |
|---|---|---|---|---|---|---|---|
| SR.NO:3887015 | Single Triode | 9.0 mA | 10.8 mA | 120% | 2600 | 3400 | 131% |
| SR.NO:3887009 | Single Triode | 9.0 mA | 10.8 mA | 120% | 2600 | 3380 | 130% |
| SR.NO:3887005 | Single Triode | 9.0 mA | 12.4 mA | 138% | 2600 | 3500 | 135% |
| SR.NO:3887004 | Single Triode | 9.0 mA | 12.3 mA | 137% | 2600 | 3500 | 135% |
Technical Note: Custom duties and taxes are the responsibility of the buyer in their country.
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