Matched Pair Philips Miniwatt PCF80 9U8 Vacuum Tubes Valves

Matched Pair Philips Miniwatt PCF80 9U8 Vacuum Tubes ValvesThis 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 66 for Tube One and 85 70 for Tube Two where minimum (65%) is 57 57 and 100% is 88 88. WE HAVE SCORES OF THOUSANDS OF VACUUM TUBES. IF IT'S NOT LISTED, WE MAY HAVE IT. PLEASE ALSO SEE OUT ETSY SISTER SITE "LOWTECHELEC" AND OR CALL OR TEXT US AT 202 372 6931 IF YOU DO NOT

new in box GE 12AX4 tubes tested to spec on our Paul Hart-calibrated TV7/U

EIA Factory Codes: none

Transconductance measured 58 for Tube One and 58 for Tube Two where minimum (65%) is 40

These six 12BY7 / 12BY7A / 12BV7 tubes tested as follows on our Paul Hart-calibrated TV7/U where minimum (65%) is 46:

3 dB (-92 dB is the Maxi-Matcher's noise floor)

There was no gas and it tested 2170 micromhos with a plate current draw of 25

This amp was designed to use 6SN7s and I do not recommend using 12SN7s

Tube One measured 30 while Tube Two measured 32 where minimum (65%) is 22

The 1P21 is missing a pin

This black plate Sylvania 5Y3GT rectifier tube was tested on our Paul Hart-calibrated TV7/U for shorts

nice flashing and ribbed

new in box matched pair of RCA 6GU7 dual triodes was tested on our Jackson 648 Mutual Conductance tester for shorts