Sylvania EZ81 / 6CA4 Vacuum Tube Valve Rectifier Mainstream MS 503 LP not included) in my AC-heated

not included) in my AC-heated Alan Eaton single-ended 45 amplifier and they sound OK

These four US-made new old stock

They appear unused and come with boxes

new in box GE 6BW4 tube tested to spec on our Paul Hart-calibrated TV7/U

Sylvania EZ81 / 6CA4 Vacuum Tube Valve Rectifier Mainstream MS 503 LP not included) in my AC-heatedThis Sylvania 6CA4 EZ81 rectifier tube was tested on our Paul Hart calibrated TV7 U. It measured a perfectly balanced 51 51 where minimum (65%) is 40 40 and 100% is 62 62. 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