RCA 931 931A Photomultiplier Vacuum Tube

RCA 931 931A Photomultiplier Vacuum TubeThis RCA 931A photomultiplier tube could not be tested and are 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

This Matsushita-MANUFACTURED

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new in box matched pair of GE 12SN7GTA dual triodes was tested on our Paul Hart-calibrated TV7/U for shorts

excellent flashing and FC MRG date codes

new in box US-made number / type 58 tubes tested to spec on our Paul Hart-calibrated TV7/U

new in box black plate National Union 1N6G tube tested to spec on our Paul Hart-calibrated TV7/U

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

The links themselves also lack reference numbers and

new in box Sylvania 14R7 tubes tested tested to spec on our Paul Hart-calibrated TV7/U

Tube One measured 60/50 while Tube Two measured 61/51 where minimum (65%) is 50/50 and 100% is 77/77