5 RCA 6S4 6S4A Vacuum Tubes Black Plate Lot Of Five

5 RCA 6S4 6S4A Vacuum Tubes Black Plate Lot Of FiveThese five RCA black plate 6S4A tubes were tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas and they measure as follows: 49, 63, 66, 68 and 74 where minimum (65%) is 52 and 100% is 80. WE HAVE SCORES OF THOUSANDS OF VACUUM TUBES. IF IT'S NOT LISTED, WE MAY HAVE IT. PLEASE ALSO SEE OUT ETSY SISTER SITE "LOWTECHTWOO" AND OR CALL OR TEXT US AT 202 372 6931 IF YOU DO NOT SEE WHAT YOU NEED OR HAVE

Tube Three measured 76/76 where minimum (65%) is 50/50 and 100% is 77/77

This new old stock-testing matched pair of Sylvania 6AU6A tubes was tested on our Paul Hart-calibrated TV7/U for shorts

I am playing them in my Mini Mite 2013 as I write and they sound excellent

new in box nearly-perfectly-matched pair of GE-MANUFACTURED 6FQ7 / 6CG7 dual triodes was tested on our Paul Hart-calibrated TV7/U for shorts

These four metal base National Union 6Q7GT tubes tested to spec on our Paul Hart-calibrated TV7/U

This Sylvania 1629 / VT-138 milspec magic eye indicator tube tested very well on our Paul Hart-calibrated TV7/U

but the bottle is firmly-cemented to it and there is no movement at all possible

Bottom: smooth

Transconductance measured 54 for Tube One and 56 for Tube Two where minimum (65%) is 40 and 100% is 62

vertical support rods for lowered microphonics

Transconductance measured 2830 micromhos for Tube One and 2720 for Tube Two

It sounds very good with only an occasional click and pop