RCA Number / Type 37 #37 Vacuum Tube NOS NIB 1st Quarter BW03 These tubes have black and

These tubes have black and silver bottles

new in box RCA 17AY3 / 17AY3A / 17BS3 / 17BS3A tubes tested to spec on our Paul Hart-calibrated TV7/U

Both are acid-etched

This nicely-illustrated story book is in very good condition

copper support rods and great flashing

RCA Number / Type 37 #37 Vacuum Tube NOS NIB 1st Quarter BW03 These tubes have black andThis new old stock, new in box RCA Number 37 tube tested to spec on our Paul Hart calibrated TV7 U. 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 PROTECTION COVERS ITEMS UP TO