Matched Pair Super Silvertone Number / Type 27 #27 Vacuum Tubes Black Plates

Matched Pair Super Silvertone Number / Type 27 #27 Vacuum Tubes Black PlatesThis matched pair of Super Silvertone Type 27 triodes was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. Transconductance measured 27 for Tube One and 30 for Tube Two where minimum (65%) is 25. The tubes have black plates; sheet getters; excellent flashing and well secured bases and bottles that are nice and tight. WE HAVE SCORES OF THOUSANDS OF VACUUM TUBES. IF IT'S NOT LISTED, WE MAY HAVE

It measured 40/40 where minimum (65%) is 40/40 and 100% is 62/62

They measured (from left to right) 46

1 milliamps and had a transconductance reading of 2560 micromhos

They were Apex-matched

This new old stock-testing matched pair of Philips Miniwatt PCF80 / 9U8 tubes was tested on our Paul Hart-calibrated TV7/U for shorts

Transconductance measured 58 for Tube One and 60 for Tube Two where minimum (65%) is 40

Minimum (65%) is 40 and their readings are shown in Picture Two Three

This lot of four US-made industrial-grade 1852 (6AC7) tubes was tested on our Paul Hart-calibrated TV7/U for shorts

This pair of Raytheon 7189 (6BQ5 / EL84) output tubes was tested on our Maxi-Matcher 2 for shorts

This lot of three US-made type 42 tubes was tested our Paul Hart-calibrated TV7/U for shorts

new in box Matsushita 9AQ5 / PCC85 tubes tested to spec on our Paul Hart-calibrated TV7/U

These seven Philco number / type 27 tubes tested as good on our Paul Hart-calibrated TV7/U