Matched Pair General Electric GE 6BL7 6BL7GTA Vacuum Tubes Valves NOS NIB Princeton University hanging filaments

hanging filaments

new in box Trigon UCH81 tube tested to spec on our Paul Hart-calibrated TV7/U

I have played them in my Musical Paradise 301 MK 3 with adapters (not included) as 6SJ7 substitutes and they sound excellent -- airy with excellent dynamics and signal bandwidth

Both have REI date codes

Matched Pair General Electric GE 6BL7 6BL7GTA Vacuum Tubes Valves NOS NIB Princeton University hanging filamentsThis new old stock, new in box matched pair of GE 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 56 56 for Tube One and 58 58 for Tube Two where minimum (65%) is 25 25 and 100% is 38. 5 38. 5. They have chamfered top O getters; steel support rods; great flashing; stout gray plates; anode radiators for cooler operation and longer life and