4 Sylvania 7X7 Vacuum Tubes NOS NIB Lot Of Four T37 dark gray rounded plates and

dark gray rounded plates and outstanding flashing

They tested 50/38

This lot of six Zenith number / type 58 stamped- / engraved-base tubes was tested on our Paul Hart-calibrated TV7/U for shorts

This amp was designed to use 6SN7s and I do not recommend using 12SN7s

thick glass and micanol bases

4 Sylvania 7X7 Vacuum Tubes NOS NIB Lot Of Four T37 dark gray rounded plates andThis lot of four new old stock, new in box Sylvania MANUFACTURED 7X7 tubes 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