Matched Quad Philips Miniwatt PCF80 9U8 Vacuum Tubes Special Edition They are dead quiet when

They are dead quiet when the CD player is muted and have excellent frequency response

Transconductance was 2810 micromhos for Tube One and 2900 for Tube Two

art nouveau look

Transconductance was 1890 for Tube One and 2000 for Tube Two where new/nominal is within one standard deviation of 1900

One is a 1P21 while the other could not be identified

Matched Quad Philips Miniwatt PCF80 9U8 Vacuum Tubes Special Edition They are dead quiet whenThis matched pair of Philips Miniwatt PCF80 9U8 tubes was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. They measured 85 82, 101 83, 102 83 and 102 86, respectively. Minimum (65%) is 57 57. 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