General Electric EI 40KG6 40KG6A PL509 Vacuum Tube NOS NIB 10E This new old stock-testing Sylvania

This new old stock-testing Sylvania engraved base type 48 tube was tested our Paul Hart-calibrated TV7/U for shorts

The 7025 has somewhat-different gain characteristics than the standard 12AX7

new in box US-made 22KV6 / 22KV6A tubes tested to spec on our Paul Hart-calibrated TV7/U

Plates: gray ladder plate

General Electric EI 40KG6 40KG6A PL509 Vacuum Tube NOS NIB 10E This new old stock-testing SylvaniaThis new old stock, new in box EI MANUFACTURED, GE BRANDED 40KG6A PL509 tube tested to spec on our Paul Hart calibrated TV7 U. As you can see, it was made in Yugoslavia. 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