Matched Pair Sovtek 6BQ5 EL84 Vacuum Tubes Valves NOS-Testing 6B8 Octal new in box Raytheon 40KG6

new in box Raytheon 40KG6 tube tested to spec on our Paul Hart-calibrated TV7/U

These six US-made 5U8 tubes tested to spec on our Paul Hart-calibrated TV7/U

but this does not affect performance at sound pressure levels far above normal playback even though the speakers are on the same equipment rack

They have great bass and sparkling highs and Mann's voice is warm and clear as a bell

new in box matched pair of Transleteronic 6AK5 tubes was tested on our Paul Hart-calibrated TV7/U for shorts

Matched Pair Sovtek 6BQ5 EL84 Vacuum Tubes Valves NOS-Testing 6B8 Octal new in box Raytheon 40KG6This 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, gas and transconductance. There were no shorts or gas. Transconductance measured 7240 micromhos for Tube One and 7270 for Tube Two. Plate current draw was 25 milliamps for both tubes. (New EL84s typically test from the mid 20s to mid 30s with