Matched Pair Toshiba 6FQ7 6CG7 Vacuum Tubes Copper Support Rods

Matched Pair Toshiba 6FQ7 6CG7 Vacuum Tubes Copper Support RodsThis matched pair of 6FQ7 dual triodes was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. Transconductance measured 67 in Section One and 68 in Section Two for Tube One and 69 70 in Tube Two where minimum (65%) is 50 50 and 100% is 77 77. They have short, gray plates; O getters; copper support rods and excellent flashing. As I write, I am playing them in my Sound Craftsmen RC 2 monoblocks

new in box GE 12BR7 tubes tested to spec on our Paul Hart-calibrated TV7/U

I just cleaned this four LP set on my VPI 16

new in box Raytheon 10EG7 tube tested to spec on our Paul Hart-calibrated TV7/U

This matched pair of Raytheon 6AK5 black plate tubes was tested on our Paul Hart-calibrated TV7/U

These tubes have matching 2105017 provenance/date codes

5 record cleaner and then played it on my solid Rega Planar Three

Transconductance measured 45 in Section One and 50 in Section Two for Tube One and 50/44 in Tube Two where minimum (65%) is 50/50 and 100% is 77/77

the centering pin is missing on Tube One and Tube Two's base is cracked

Lancashire in the first week of November

5-8 out of 10

Transconductance measured 116%/104% where minimum (65%) is 70%/70%

Transconductance: 2310 micromhos Transconductance: 2130 micromhos