Matched Pair RCA 6AK5 Vacuum Tubes Steel Plate NOS NIB

Matched Pair RCA 6AK5 Vacuum Tubes Steel Plate NOS NIBThis new old stock, new in box matched pair of RCA steel plate 6AK5 tubes was tested on our Paul Hart calibrated TV7 U tester for shorts, gas and transconductance. There were no shorts or gas. Tube One measured 30 while Tube Two measured 32 where minimum (65%) is 22. I am playing them now in my Mini 2013 as I write and they sound excellent. WE HAVE SCORES OF THOUSANDS OF VACUUM TUBES. IF IT'S NOT LISTED, WE MAY HAVE IT. PLEASE ALSO SEE OUT ETSY SISTER

5 standard deviation of 4000 micromhos

This matched trio of RCA 5Z4 rectifier tubes were tested on our Paul Hart-calibrated TV7/U for shorts

but has GE 188-5 and a sutured top

44 and 46 where minimum (65%) is 29

They were Apex-matched

IN NEARLY 9000 SALES IN BOTH OF OUR ETSY STORES

These five Philco Type 37 triodes were tested on our Paul Hart-calibrated TV7/U for shorts

this tube does not have a center tap and cannot run on double 6

New / nominal transconductance is within one standard deviation of 1900

new in box US-made 9AU7 tubes tested to spec on our Paul Hart-calibrated TV7/U

Etsy will indicate how many remain in this Dutch auction

new in box matched pair of RCA 6GU7 dual triodes was tested on our Jackson 648 Mutual Conductance tester for shorts