Sylvania Number Type 30 #30 Vacuum Tube Engraved Base ST Shoulder Shape NOS-Testing

Sylvania Number Type 30 #30 Vacuum Tube Engraved Base ST Shoulder Shape NOS-TestingThis 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

Tube Four: 34/2240 where new/nominal is within one standard deviation of 1900

These tubes have excellent frequency response

This pressing has lightl surface noise audible in quiet passages and barely-audible in voice-level passages

new in box RCA Radiotron 12SH7 tubes tested to spec on our Paul Hart-calibrated TV7/U

This Westinghouse black plate 7AU7 tube tested to spec on our Paul Hart-calibrated TV7/U

where minimum (65%) is 60

new in box National Union 35/51 tube tested to spec on our Paul Hart-calibrated TV7/U

These five US-made 2D21 tubes were tested on our Paul Hart-calibrated TV7/U for shorts

new in box US-made 5CL8A tubes tested to spec on our Paul Hart-calibrated TV7/U

I am playing them as I write with Mino Cinelu's eponymous album in my Mini Mite 2013 and they sound great

Tube One measured 31 while Tube Two measured 33 where minimum (65%) is 22 and 100% is 34

where minimum (65%) is 38/38