Matched Pair Amperex 6BL8 Vacuum Tubes Valves 7199 Substitute New Sound Of Los side O getters and excellent

side O getters and excellent flashing

This new old stock-testing almost-perfectly-matched pair of Sovtek 6BQ5 / EL84 / 6P14 / 6P14P output tubes was tested on our Maxi-Matcher 2 -- with 325 volts on the plates and a bias of -14 volts -- for shorts

they were very brittle

new in box GE 6HB7 tubes tested to spec on our Paul Hart-calibrated TV7/U

Matched Pair Amperex 6BL8 Vacuum Tubes Valves 7199 Substitute New Sound Of Los side O getters and excellentThis matched pair of French 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 38 39 for Tube One and 41 35 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