6 Sylvania 6S4 6S4A Vacuum Tubes NOS NIB Lot Of Six Ken-Rad NOS NIB new in box and tested

new in box and tested to spec on our Paul Hart-calibrated TV7/U

These two US-made 14A4 tubes tested to spec on our Paul Hart-calibrated TV-7/U

I just read the liner notes and I was right about this album sounding 15-20 years ahead of its time as it was

They are dead quiet when the preamp is muted and have excellent frequency response

Tube One measured 95%/93% and 95%/94% for Tube Two

6 Sylvania 6S4 6S4A Vacuum Tubes NOS NIB Lot Of Six Ken-Rad NOS NIB new in box and testedThis lot of six new old stock, new in box Sylvania 6S4A tubes tested to spec on our Paul Hart calibrated TV7 U. Five are 6S4As and one is a 6S4. 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.