Matched Pair Philips Miniwatt PCF80 9U8 Vacuum Tubes NOS-Testing

Matched Pair Philips Miniwatt PCF80 9U8 Vacuum Tubes NOS-TestingThis new old stock testing 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 90 82 for Tube One and 91 84 for Tube Two 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

new in box US-made 45Z3 tubes tested to spec on our Paul Hart-calibrated TV7/U

new in box RCA Radiotron 12SH7 tubes tested to spec on our Paul Hart-calibrated TV7/U

I have played it in my Bottlehead Crack headphone amplifier and it sounds outstanding

54/53 and 54/55

5 record cleaner and played on my Rega Planar Three

audible only in pianissimo passages

Tube One drew 26

WE HAVE TENS OF THOUSANDS 0F VACUUM TUBES

new in box US-made 6FS5 tubes tested to spec on our Paul Hart-calibrated TV7/U

new in box Tung-Sol 25W4GT tube tested to spec on our Paul Hart-calibrated TV7/U

There were no shorts or gas and they measured as follows (from left to right

The reference to "Uncle Doug" is a hat tip to The Most Sublime Guitar Amplifier Guru who recommended a significant -- but not-too-large -- difference in plate current draw for just that right amount of push-pull distortion