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

Matched Pair General Electric GE 6BL7 6BL7GTA Vacuum Tubes Valves NOS NIB Princeton UniversityThis 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

This perfectly-matched pair of new old stock

Source material is The Beatles "Yellow Submarine Songbook" and they sound terrific

Tube Two tested 24

I can't tell you how they sound as we don't have any equipment that runs them

5 out of ten

Tube One (Philco-LABELED

hanging filaments

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

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

These tubes have tall bases

Both have REI date codes

but their bottles are