Matched pair of Sylvania 6L6GC STR415 "OO" top foil getter tubes of identical design with barely any use, electronically matched to about 2% in both Gm (mutual conductance) and mA (current). STR tubes were S pecial T ubes R equests by US amp manufacturers for double top mica, thicker glass and heavier wire heaters designed to withstand higher voltages and last longer than regular commercial tubes. Auditioned in our amplifier and they work perfectly, sound bright and clean with excellent detail and a nice solid bass!
Plenty of headroom with these and excellent silver flashing too! Compatible and safe to use in all 6L6GC, KT66 and 7581 amplifiers with no mods needed.Brand on tube Philips ECG, (worn) Actual mfr Sylvania ECG Country of Mfr USA Date codes. This item is in the category "Musical Instruments & Gear\Guitars & Basses\Guitar Amplifiers". The seller is "hmb3823" and is located in this country: US. This item can be shipped worldwide.