Sylvania Number Type 30 #30 Vacuum Tube Engraved Base ST Shoulder Shape NOS-Testing 6W4 Black Plate

Sylvania Number Type 30 #30 Vacuum Tube Engraved Base ST Shoulder Shape NOS-Testing 6W4 Black PlateThis 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

Plate current measured 20

54 and 54 where minimum (65%) is 38

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

This amp was designed to use 6SN7s and I do not recommend using 12SN7s

coke-bottle-shape glass envelopes and terrific flashing

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

This new-looking Baird Atomic GS10C/S CV2325 Dekatron counting tube looks new

Tube One measured 1380 micromhos and drew 10

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

new in box matched pair of Tung-Sol 6AK5 tubes was tested on our Paul Hart-calibrated TV7/U for shorts

These tubes have mica snubbers for increased stability and lowered microphonics

I have played it in my Schiit Vali 2 headphone amplifier and it sounds outstanding