Sylvania Number Type 30 #30 Vacuum Tube Engraved Base ST Shoulder Shape NOS-Testing 6W4 Black Plate This amp was designed to

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 25CD6GB tube tested to spec on our Paul Hart-calibrated TV7/U

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

Plate current measured 20

Sylvania Number Type 30 #30 Vacuum Tube Engraved Base ST Shoulder Shape NOS-Testing 6W4 Black Plate This amp was designed toThis 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