Matched Pair General Electric GE 12B4 12B4A Vacuum Tubes Black Plates Copper Support Rods NOS-Testing TA2

Matched Pair General Electric GE 12B4 12B4A Vacuum Tubes Black Plates Copper Support Rods NOS-Testing TA2This new old stock testing matched pair of GE 12B4A tubes was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. Tube One measured 44 while Tube Two measured 48 where minimum (65%) is 32 and 100% is 49. Wish I could tell you how they sound, but I don't have any equipment that uses these. WE HAVE SCORES OF THOUSANDS OF VACUUM TUBES. IF IT'S NOT LISTED, WE MAY HAVE IT. PLEASE ALSO SEE OUT ETSY

These tubes have great bass and sparkling highs and Mann's voice is warm and clear as a bell even though they test on the cusp

Tube One drew 21

new in box Philco 3AL5 tube -- and several others just like it --tested to spec on our Paul Hart-calibrated TV7/U

these tubes are quite pretty with old-fashioned shoulder bottles and should work fine in most applications

a 56-35 date and excellent flashing

44 and 48 where minimum (65%) is 30 and 100% is 46

They have been tested on our Paul Hart-calibrated TV7/U (where minimum (65%) is 45) and have the following values in descending order: They measured 57

They are exactly-the same on the inside

Kreisler and Bach played masterfully by Abramas Sipolniek on Organ

Tube Three measured 58

where minimum (65%) is 38/38

new in box Hytron 12BA6 tested to spec on our Paul Hart-calibrated TV7/U