Sylvania Black Plate 5U4 5U4G Vacuum Tube Rectifier Shoulder ST Shape June 19 2024 I am writing during the

I am writing during the first few pianissimo minutes and the surface noise is distracting

(New 12AT7s / ECC81 typically test within 1

This lot of three Arcturus 6L7 tubes was tested on our Paul Hart-calibrated TV7/U for shorts

AND RELATED ANALOG AUDIO ITEMS

new in box GE 21LU8 tubes tested to spec on our Paul Hart-calibrated TV7/U

Sylvania Black Plate 5U4 5U4G Vacuum Tube Rectifier Shoulder ST Shape June 19 2024 I am writing during theThis Sylvania 5U4G rectifier tube tested an underwhelming 32 in Section One and 44 in Section Two on our Paul Hart calibrated TV7 U where minimum (65%) is 40 40 and 100% is 62 62. It has a bottom D getter; a 313 date code and mediocre flashing. IT IS MISSING ITS CENTERING PIN. THE BASE HAS BEEN MARKED FOR SAFE AND EASY INSERTION. WE HAVE SCORES OF THOUSANDS OF VACUUM TUBES. IF IT'S NOT LISTED, WE MAY HAVE IT. PLEASE ALSO SEE OUT ETSY SISTER SITE