General Electric GE 5U4 5U4GB Vacuum Tube Rectifier Black Plate JANCG6Y6GT I am playing them in

I am playing them in one of my Radio Craftsmen SC-2 monoblocks as I write

I am playing it in one of my ArtSound monoblocks as I write and it is absolutely silent

new in box US-made 12K5 tubes tested to spec on our Paul Hart-calibrated TV7/U

(New 12AT7s / ECC81 typically test within 1

General Electric GE 5U4 5U4GB Vacuum Tube Rectifier Black Plate JANCG6Y6GT I am playing them inThis new old stock testing GE 5U4GB rectifier tube was tested on our Paul Hart calibrated tube tester for shorts, gas and transconductance. It tested 56 in Section One and 56 in Section Two where minimum (65%) is 40. It has coarsely crenelated round mica spacers; black plates and a side D getter. 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