Matched Pair Amperex 6BL8 Vacuum Tubes Valves 7199 Substitute JRC-9006 Septal They measured (from left to

They measured (from left to right) 46

Tube Eight: 37

new in box US-made 6KY8A tubes tested to spec on our Paul Hart-calibrated TV7/U

IN WELL OVER 6000 TRANSACTIONS

It measured 50/46 where minimum (65%) is 40/40 and 100% is 62/62

Matched Pair Amperex 6BL8 Vacuum Tubes Valves 7199 Substitute JRC-9006 Septal They measured (from left toThis 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