4 Sylvania 5Z4 Vacuum Tubes Valves Rectifier Lot Of Four The Cultures Of It is dead quiet when

It is dead quiet when the preamp is muted and has excellent frequency response even though this amp was designed for 6SN7s

I am playing them in one of my Radio Craftsmen SC-2 monoblocks as I write

new in box Zenith 25Z5 tubes tested to spec on our Paul Hart-calibrated TV7/U

60 and 82 where 40 is minimum

This perfectly-matched pair of GE nickel plate 6AU6 tubes was tested on our Paul Hart-calibrated TV7/U for shorts

4 Sylvania 5Z4 Vacuum Tubes Valves Rectifier Lot Of Four The Cultures Of It is dead quiet whenThese four Sylvania 5Z4 rectifier tubes were tested on our Paul Hart calibrated TV7 U for shorts, gas and emissions. They tested 46 52, 49 47, 51 51 and 52 52 respectively, where minimum (65%) is 40 40. 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