Matched Quad Philips Miniwatt PCF80 9U8 Vacuum Tubes Brimar NOS NIB

Matched Quad Philips Miniwatt PCF80 9U8 Vacuum Tubes Brimar NOS NIBThis 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 80 66, 80 70, 80 70 and 82 70, respectively where 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

things have obviously improved

These five GE 6BL8 tubes tested to spec on our Paul Hart-calibrated TV7/U

new in box milspec black plate GE 6Y6GT / JAN-CG-6Y6GT tubes both tested 56 on our Paul Hart-calibrated TV7/U where minimum (65%) is 40 and 100% is 62

new in box Philco 3AL5 tube -- and several others just like it --tested to spec on our Paul Hart-calibrated TV7/U

I am playing them in my ArtSound single-ended 805 monoblocks with Steely Dan’s seminal "Aja" album

65 and 79 where minimum (65%) is 45

They have top D getters

rectangular mica spacers and gapped-D getters

I am playing it in my Pro-Ject Tube Box S phono pre-preamplifier (tube on right) with John Mayall’s seminal "The Blues Alone" album

Transconductance was 1620 for Tube One and 1730 for Tube Two where new/nominal is within one standard deviation of 1900

This matched pair of RCA 6K6GT tubes was tested on our Maxi-Matcher tube tester with 325 volts on the plates and a bias of -36 volts

There are practically-no pops and ticks