Sylvania Number Type 30 #30 Vacuum Tube Engraved Base ST Shoulder Shape NOS-Testing 6W4 Black Plate new in box GE 6AU6

new in box GE 6AU6 / 6136 tested to spec on our Paul Hart-calibrated TV7/U

These tubes have mica snubbers for increased stability and lowered microphonics

new in box GE 25CD6GB tube tested to spec on our Paul Hart-calibrated TV7/U

Transconductance was 1530 for Tube One and 1430 for Tube Two where new/nominal is within one standard deviation of 1900

Tube One measured 1380 micromhos and drew 10

Sylvania Number Type 30 #30 Vacuum Tube Engraved Base ST Shoulder Shape NOS-Testing 6W4 Black Plate new in box GE 6AU6This new old stock testing engraved base Sylvania number type #30 tube tested 31 on our Paul Hart calibrated TV7 U where minimum is 23 and 100% is 35. 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 ANY QUESTIONS. 1. MOST FORMS OF SHIPPING EXCEPT MEDIA MAIL ARE AUTOMATICALLY INSURED UP TO