4 US-Made 14A7 Vacuum Tubes Valves NOS NIB Lot Of Four ECC83 Art Sound new in box Sylvania 38HE7

new in box Sylvania 38HE7 tube tested to spec on our Paul Hart-calibrated Hickok TV7/U

Silvertone-BRANDED 6K7GT tubes was tested on our Paul Hart-calibrated TV7/U for shorts

These four Philco clear bottle type / number 41 tubes tested as follows on our Paul Hart-calibrated TV7/U:

Transconductance measured 50/52 for Tube One and 53/52 for Tube Two where minimum (65%) is 25/25 and 100% is 39/39

4 US-Made 14A7 Vacuum Tubes Valves NOS NIB Lot Of Four ECC83 Art Sound new in box Sylvania 38HE7These new old stock, new in box 14A7 tubes tested tested to spec on our Paul Hart calibrated TV7 U. Two are GE and two are Sylvania. 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 $100. ETSY PURCHASE