Matched Pair Sylvania 6BL7 6BL7GTA Vacuum Tubes Triple 3 Mica NOS NIB Music Of The They have 3-13 188-5 and

They have 3-13 188-5 and 3-26 188-5 date/provenance codes

Tube One (Philco-LABELED

I am playing them as I write in one of my Mini Mite 2013 with the Mobile Fidelity version of Pink Floyd's "Live At Montreux" and they sound great

This double CD plays fine

side harp getters

Matched Pair Sylvania 6BL7 6BL7GTA Vacuum Tubes Triple 3 Mica NOS NIB Music Of The They have 3-13 188-5 andThis 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