Matched Pair GE JAN 5654W Fully Tested Vacuum Tubes 6AK5 5654 EF95 6J1

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Riverstone Audio - Matched Pair (2 Tubes) 7-Pin GE JAN 5654W Fully-Tested Vacuum Tubes 5654 / 6AK5 / 6J1 / 6J1P / EF95 Audio Amplifier Electron Tube Upgrade
Description
Closely Matched Pair (2 tubes) of 7-Pin NIB/NOS GE JAN 5654W Vacuum Tubes. Considered one of the best of the 5654/6AK5/EF95 family of tubes for audio use. 5654W tubes are Mil. Spec. (JAN) Electron Tubes - Higher Durability and Life. Vacuum tubes were obtained from factory sealed military surplus boxes and are guaranteed to test at NOS levels.
**PLEASE NOTE** 5654W tubes can ONLY be used to replace 7-Pin 6J1, 6J1P, 6AK5, 6AK5W or EF95 tubes. Do not substitute for other 7-pin tubes or tubes with different codes. If in doubt, check with your amplifier manufacturer (or contact us) to verify that 5654W tubes can be used as a replacement in your particular audio device.
Tested and matched by Riverstone Audio utilizing the best available equipment (Amplitrex AT1000). We do not sell untested tubes - never have and never will. Our engineers match tubes for BOTH plate current and mutual conductance, with test results clearly listed on each tube box. All tubes must also pass a specialized life test and an audio sound test. The 5654W tubes selected for these matched pairs test at NOS levels at or above 5000 micro-mho and at a plate current of 7.2 mA or higher.
Only the best tubes are considered for our matched tube sets. Fewer than 50% of the NOS 5654 tubes we test meet our standards for high fidelity audio use and are considered for use in our matched tube sets.
Vacuum tubes sold by Riverstone Audio will have the "Riverstone Audio" name, logo and QC label on the boxes. For matched 5654W tube quads please visit our Amazon Storefront.
A very closely matched pair (2 tubes) of NOS GE mil-spec JAN 5654W vacuum tubes. Amplitrex matched for BOTH plate current and Gm and subjected to multiple test cycles to determine stability. 5654W tubes were originally designed as a premium-grade substitute for 6AK5 and EF95 vacuum tubes. The "W" designation refers to ruggedized, military grade, tubes; better quality control and internal design changes to enhance reliability and minimize microphonics. This great sounding vintage tube has found new life as a replacement for 7-pin 6J1, 6AK5 and EF95 tubes - and is used by audiophiles looking for improved sound quality. In addition to ip, Gm, leakage/gas, noise and life testing, the matched tubes undergo a final audio sound check to make certain they are indeed audio quality. Tubes that show the slightest abnormality are rejected. With our high standards, less than 50% of the NOS 5654W tubes we test are considered for use in these special matched sets. Tubes selected for matched pairs have identical date codes and are guaranteed to test at NOS levels of 5000 micro-mho or higher and a plate current (ip) of 7.2 mA or higher. (Tested in fixed-bias mode at a plate and screen voltage of 120 V and a grid voltage of -2.0 V). For each matched pair, both mutual conductance and plate current differ by less than 4%. All tubes tested/matched by Riverstone Audio will have our logo/QC labels on the boxes and are guaranteed to be genuine NOS and test at NOS levels. ***PLEASE NOTE*** 5654W tubes are 7-pin and can ONLY be used to replace 6AK5, EF95, 6J1 and 6J1P tubes. DO NOT use to replace any other type of tube. Please verify with the manufacturer of your audio device that 5654W tubes are a suitable substitute.
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