Matched Pair Sylvania 6BL7 6BL7GTA Vacuum Tubes Triple 3 Mica NOS NIB Music Of The I have played it in

I have played it in my Bottlehead Crack headphone amp and it sounds great

Tube One measured 60/56 while Tube Two measured 61/58 where minimum (65%) is 50/50 and 100% is 77/77

Tube One (Philco-LABELED

new in box GE 5 Star 5663 premium tube tested to spec on our Paul Hart-calibrated TV7/U

(New 12AU7s typically test within one standard deviation of 2200 micromhos

Matched Pair Sylvania 6BL7 6BL7GTA Vacuum Tubes Triple 3 Mica NOS NIB Music Of The I have played it inThis new old stock, new in box, almost perfectly matched pair of Sylvania MANUFACTURED 6BL7GTA dual triodes was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. Transconductance measured 46 48 for Tube One and 48 47 for Tube Two (Sylvania MANUFACTURED, RCA LABELED). (Minimum (65%) is 25.) They have top D getters; anode radiators for cooler operation and longer tube life; copper support rods; a