6 12BY7 12BY7A 12BV7 Gray Glass Vacuum Tubes Lot Of Six 5654 Septal gas and transconductance with 400

gas and transconductance with 400 volts on the plates and a bias of -48 volts

gas and emissions

They have shoulder / ST bottles

This matched pair of Sylvania-MANUFACTURED

6 12BY7 12BY7A 12BV7 Gray Glass Vacuum Tubes Lot Of Six 5654 Septal gas and transconductance with 400These six gray glass 12BY7 12BY7A 12BV7 tubes tested as follows on our Paul Hart calibrated TV7 U where minimum (65%) is 46: 40, 47, 52, 53, 53 and 54. 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