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

All Vintage Vacuum Tubes Sold By Riverstone Audio Are Backed By Our No-Nonsense 3-Year Warranty. Important: Amplifer Damage Can Occur If The Wrong Type Of Tubes Are Used. 5654W Tubes Are A Direct Substitute For 7-Pin 6J1, 6J1P / 6J1P-Eb / 6Zh1P-Ev, 6Ak5, 6Ak5W, Ef95 And 403B Tubes. For Other Substitutions, Check With Your Amplifier Manufacturer. Plate Current And Gm Are Both Matched Within 3%. 5654W Tubes Were Originally Designed As A Low-Noise Upgrade For 6Ak5 And Ef95 Vacuum Tubes. The 'W' Designation Refers To Ruggedized Military-Grade Tubes With Better Quality Control And Enhanced Reliability. These Vintage Tubes Have Found New Life As A Replacement For 7-Pin 6J1, 6J1P (6Zh1P-Ev), 6Ak5 And Ef95 Tubes And Are Used By Audiophiles For Improved Sound Quality. We Guarantee The Tubes Will Test At Nos Levels Of 4500 Micro-Mho Or Higher And A Plate Current (Ip) Of 6.6 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). All Vacuum Tubes We Sell Are Carefully Packed For Shipping And Will Have Riverstone Audio Name, Logo And Qc Labels On The Boxes.