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

• 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 a no-nonsense 2-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.

• Ensure your amplifier, preamp, or DAC is powered off and unplugged from the mains. Consult your device's manual to locate the tube sockets and identify the correct tube type and orientation. — Prepare Your Audio Device
• Gently grip the old tubes by their glass or base (avoiding bare finger contact with the glass) and pull them straight out of their sockets. If they are stuck, a gentle rocking motion may help. — Carefully Remove Old Tubes
• Align the pins of the Riverstone Audio 5654W tubes with the socket holes, ensuring correct orientation. Push them in gently but firmly until fully seated. Do not force the tubes; if resistance is met, re-check alignment. — Install New Riverstone Audio Tubes
• Plug your device back in, turn it on, and allow the tubes to warm up (typically 30 seconds to a few minutes). Listen for improved sound quality, reduced noise, and balanced stereo performance. — Power On and Test

Typical situations where Riverstone Audio Tested/Matched Pair (2 Tubes) 7-Pin JAN 5654W Vacuum Tubes - Platinum Grade Upgrade for 6AK5 / 6J1 / EF95 helps — illustrative scenarios, not customer reviews.