Zenith 6BK7 6BK7B Vacuum Tube NOS NIB For Your Schiit W H Freeman Both measured 54 were minimum

Both measured 54 were minimum (65%) is 36 and 100% is 55

These nine National Union number / type 27 tubes tested as good on our Paul Hart-calibrated TV7/U

An eight out of ten with an ice bottom end

Admiral-BRANDED 5V4G rectifier tube was tested on our Paul Hart-calibrated TV7/U

I am playing them in one my Radio Craftsman RC2 mono blocks as I write with Iggy Pop's "Raw Power" -- the closest I get to Death Metal -- and they sound excellent

Zenith 6BK7 6BK7B Vacuum Tube NOS NIB For Your Schiit W H Freeman Both measured 54 were minimumThis new old stock, new in box Zenith 6BK7B tube tested to spec on our Paul Hart calibrated TV7 U. I have played it in my Schiit Audio Vali 2 headphone amplifier and it sounded great. 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