Radio Shack Realistic Lifetime Gold Pin 5879 Vacuum Tube NOS-Testing Rectifiers 48 and 55 where minimum

48 and 55 where minimum (65%) is 36 and 100% is 55

They have G 3R and W 4R date codes

new in box National Union 12BA7 tube tested to spec on our Paul Hart-calibrated TV7/U

These five US-made

Radio Shack Realistic Lifetime Gold Pin 5879 Vacuum Tube NOS-Testing Rectifiers 48 and 55 where minimumThis new old stock testing US made Radio Shack Realistic Lifetime Gold Pin 5879 tube was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. It measured 40 where minimum (65%) is 25 and 100% is 35. This tube has top, O getters; steel support rods; gold pins and outstanding flashing. WE HAVE SCORES OF THOUSANDS OF VACUUM TUBES. IF IT'S NOT LISTED, WE MAY HAVE IT. PLEASE ALSO SEE OUT ETSY SISTER