Matched Pair General Electric GE 6BL7 6BL7GTA Vacuum Tubes NOS NIB T67 Backup T15 There is no transconductance reference

There is no transconductance reference reading on the Maxi-Matcher hence the use of the TV7/U in this category

This lot of eight 6CG7 / 6FQ7 dual triodes was tested on our Paul Hart-calibrated TV7/U for shorts

black and silver bottles and 1-35 188-5 and 1-04 188-5 provenance/date codes

This perfectly-matched pair of GE nickel plate 6AU6 tubes was tested on our Paul Hart-calibrated TV7/U for shorts

D getters and short bases

Matched Pair General Electric GE 6BL7 6BL7GTA Vacuum Tubes NOS NIB T67 Backup T15 There is no transconductance referenceThis 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