RCA 1P21 Photomultiplier Vacuum Tube 6R7 Octal T67 new in box Sylvania 6S4A

new in box Sylvania 6S4A tubes tested to spec on our Paul Hart-calibrated TV7/U

a thimble getter and excellent flashing

They have additional filaments across the top of the tube for an enhanced light show

sutured tops and excellent flashing

RCA 1P21 Photomultiplier Vacuum Tube 6R7 Octal T67 new in box Sylvania 6S4AThis 1P21 photomultiplier tubes could not be tested and is sold as is. 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 $250 IN VALUE. IF AN ITEM IS