La Radiotechnique EF86 in Original Box - Suresnes 1961 BY5 - Valvo Label - NOS

Product Summary Model: 1961 La Radiotechnique EF86 6267 (Suresnes, France) w/ Valvo Label  Features: Short Mesh Plate / O Getter  Soundlumia Tube Sound Rating: 9.0/10 - Excellent  Warm, musical and euphonic tone plus the romantic French flavor Date code: BY5 F1I1 (BY5 = EF86 production gen #5, F = Suresnes, France, 1 = 1961, I = September, 1 = Week 1 of the production month) GM (Mutual Conductance) test result: 111% NOS Silkscreen: 100% silkscreen Packaging: Original Valvo EF86 tube box Professional Tube Testing NO shorts, leakage or gas. NO noise or microphonics. This tube tested NOS (110%+ mutual conductance value for NOS/NEW) on a reliable Mercury 2000 tube tester with the following result (mutual conductance both in uMhos and in percentage of NOS/NEW value):  2,220(111%) Good tubes start at 1,200 and new tubes (incl. NOS/NIB) 2,000, and the Mercury 2000's rated mutual conductance for new EF86 tubes is 2,000. Test result can also be seen in the pict