Sylvania 6BL8 ECF80 Vacuum Tube Valve NOS NIB RCA NOS NIB I have played it in

I have played it in my Cern Audio phono pre-preamplifier as a 6SL7 substitute (with an adapter

new in box (one total) / new old stock-testing (six total) RCA 6CD6G and 6CD6GA tubes tested as follows on our Paul Hart-calibrated TV7/U:

They measured 85 and 75

new in box CBS 12DB5 tube tested to spec on our Paul Hart-calibrated TV7/U

new in box GE 12FX8A tubes tested to spec on our Paul Hart-calibrated TV7/U

Sylvania 6BL8 ECF80 Vacuum Tube Valve NOS NIB RCA NOS NIB I have played it inThis new old stock, new in box Sylvania 6BL8 ECF80 tube tested to spec on our Paul Hart calibrated TV7 U. It was made in the USA. 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