4 US-Made 12F5 12F5GT Vacuum Tubes Valves NOS NIB Lot Of Four

4 US-Made 12F5 12F5GT Vacuum Tubes Valves NOS NIB Lot Of FourThree of these four new old stock, new in box 12F5GT tubes tested to spec on our Paul Hart calibrated TV7 U. The Zenith is hermetically sealed and could not be tested. 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 OF THE TUBES WE SELL ARE OVER 70 YEARS OLD. WE CANNOT

gas and transconductance

This tube has black plates

There is also a shield between the triodes for reduced cross talk

THERE IS RISK IN LIFE

This Sylvania type 85 tube was tested on our Paul Hart-calibrated TV7/U for shorts

46 and 49 where minimum (65%) is 30 and 100% is 47

but with some wear

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

60 and 60 where minimum (65%) is 40

6 volts on the filaments

These five new old stock

new in box GE 17BE3 / 17BZ3 tubes tested to spec on our Paul Hart-calibrated TV7/U