General Electric GE 5U4 5U4GB Vacuum Tube Rectifier Black Plate JANCG6Y6GT They measured 51/51

They measured 51/51

4 dB (-92 dB is the Maxi-Matcher's noise floor)

MOST OF THE TUBES WE SELL ARE OVER 70 YEARS OLD

milspec Sylvania GB-6X4WA was tested on our Paul Hart-calibrated TV7/U for shorts

It has a banded

General Electric GE 5U4 5U4GB Vacuum Tube Rectifier Black Plate JANCG6Y6GT They measured 51/51This 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