Matched Pair Amperex 6BL8 Vacuum Tubes Valves 7199 Substitute JRC-9006 Septal new in box GE 6AM4

new in box GE 6AM4 tube tested to spec on our Paul Hart-calibrated TV7/U

Tube Eight: 37

IN WELL OVER 6000 TRANSACTIONS

perfectly-matched trio of Sylvania 7A7 tubes was tested on our Hickok 800 for shorts

Matched Pair Amperex 6BL8 Vacuum Tubes Valves 7199 Substitute JRC-9006 Septal new in box GE 6AM4This matched pair of Amperex 6BL8 pentode triode tubes was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. Transconductance measured 41 41 for Tube One and 43 41 for Tube Two where minimum (65%) is 34 36 and 100% is 52 55. As I write, I am listening to them with adapters in my Dynaco Stereo 70. They make excellent 7199 substitutes and sounded great in my amp. They were played with