Riverstone Audio - Tested/Matched Pair (2 Tubes) 7-Pin JAN 5654W Fully-Tested Vacuum Tubes - Upgrade for 6AK5 / 6J1 / 6J1P / EF95 - JAN 5654W Platinum Grade Pair

Riverstone Audio - Tested/Matched Pair (2 Tubes) 7-Pin JAN 5654W Fully-Tested Vacuum Tubes - Upgrade for 6AK5 / 6J1 / 6J1P / EF95 - JAN 5654W Platinum Grade Pair

• Tested and matched pair (2 tubes) of low-noise 7-Pin NIB/NOS JAN 5654W Vacuum Tubes. Considered one of the best of the 5654 / 6AK5 / EF95 family of tubes for audio use.
• Our platinum Grade 5654W vacuum tubes are matched within 3% for both plate current (ip) and mutual conductance (Gm) and are backed by our no-nonsense 3-year warranty.
• We guarantee that the 5654W tubes selected for our Platinum Grade matched pairs test at NOS levels at or above 4500 micro-mho with a plate current of 6.6 mA or higher. All tubes must also pass a specialized life test and an audio sound test.
• Riverstone Audio Platinum Grade tubes are provided with data labels showing measured ip and Gm.
• Amplifier damage can occur if you substitute the wrong type of tube. 5654W tubes should only be used to directly replace 7-Pin 6J1, 6J1P / 6J1P-EB / 6Zh1P-EV, 6AK5, 6AK5W and EF95 tubes. DO NOT substiture for other types of 7-pin vacuum tube unless approved as a substitute by the manufacturer of your audio device.
• For JAN 5654W tubes, water-based silk-screen printing was used for final tube-markings; the green-color print may be faded or partially missing due to the age of the tubes (the manufacture of 5654W tubes ended approx. 35 years ago). Determing the authenticity of a 5654W tube is realtively straightforward, as both "5654" and "USA" were etched into the glass during the manufacture process (this can be seen in one of the listing images). The final green-color print was used to denote additional details such, including "JAN 5654W", "Made in USA", factory logo, date-code and other tube specifications such as the "JAN" (Joint Army Navy) miltary-use designation.

As a US seller we stand behind our products. All vintage vacuum tubes sold by Riverstone Audio are backed by our no-nonsense 3-YEAR WARRANTY - THE BEST WARRANTY IN THE AUDIO TUBE BUSINESS! ***IMPORTANT: 5654W tubes can ONLY be used to replace 7-pin 6J1, 6J1P / 6J1P-EB / 6Zh1P-EV, 6AK5, 6AK5W or EF95 tubes. If in doubt check with your amplifier manufacturer to verify that 5654W tubes can be used as a replacement in your particular audio device. AMPLIFIER DAMAGE CAN OCCUR IF YOU USE THE WRONG TYPE OF TUBE AS A REPLACEMENT*** Package contains a closely matched pair (2 tubes) of vintage US-manufactured GE JAN 5654W vacuum tubes. The tubes are Amplitrex TESTED and MATCHED, and subjected to multiple test cycles to determine stability. Plate current and Gm are both matched to within 3%. Matched tubes undergo a final audio sound check to make certain they are indeed audio quality. With our high standards, FEWER THAN 40% of the NOS 5654W tubes we test are considered for use in these special matched pairs. 5654W tubes were originally designed as a low-noise premium-grade substitute for 6AK5 and EF95 vacuum tubes. The "W" designation refers to ruggedized military-grade tubes with better quality control and internal design changes to enhance reliability. These vintage tubes have found new life as replacements for 7-pin 6J1, 6J1P (6ZH1P-EV), 6AK5 and EF95 tubes and are commonly used by audiophiles for improved sound quality. When received, we guarantee the tubes will test at NOS levels of 4800 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). NOTE: Some amplifiers, such as the Little Dot 1+, MK II and MK III, may require circuit board jumpers to be changed when swapping tubes (procedure is outlined in the Little Dot manual). All vacuum tubes we sell are carefully packed for shipping and will have the "Riverstone Audio" name, logo and QC labels on the boxes.