Matched Pair Sylvania Type / Number 27 #27 Vacuum Tubes Perforated Plates 6K6 Silver Tops US-made 7C7 tubes in this

US-made 7C7 tubes in this lot

medium bottles

This milspec RCA 12K8 / VT-132 tube tested to spec on our Paul Hart-calibrated TV7/U

Transconductance measured 64/68 where minimum (65%) is 50/50 and 100% is 77/77

5 out of ten

Matched Pair Sylvania Type / Number 27 #27 Vacuum Tubes Perforated Plates 6K6 Silver Tops US-made 7C7 tubes in thisThis matched pair of Sylvania 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 32 for Tube One and 33 for Tube Two where minimum (65%) is 25. The tubes have rounded black plates; wire snubbers for increased rigidity and lowered microphonics; dimpled sheet getters; excellent flashing and well secured bases and bottles that are nice and tight. WE