General Electric GE 6C4 6C4WA Five Star Vacuum Tube Milspec Triple Mica NOS NIB

General Electric GE 6C4 6C4WA Five Star Vacuum Tube Milspec Triple Mica NOS NIBThis new old stock, new in box premium GE Five Star milspec 6C4WA tested to spec on our Paul Hart calibrated TV7 U. This tube has triple mica spaces and two additional support rods for vibration and microphonics suppression; beautiful flashing and silkscreening and a top O getter. 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

It has writing/notes in a fair amount of the book

It has dual O getters

52/34 and 56/47 where minimum (65%) is 40/45 and 100% is 62/69

side-D getters

This lot of two Sylvania 6SF7 tubes was tested on our Paul Hart-calibrated TV7/U for shorts

There were no playback issues

This RCA 6080 / 6AS7 dual triode output tube was tested on our Paul Hart-calibrated TV7/U for shorts

dark-gray plates and side

(New 12AU7s typically test within one standard deviation of 2200 micromhos

excellent flashing and 312 513 and JA MAK provenance/date codes

Transconductance measured an excellent 65/66 where minimum (65%) is 36/36

This hardcover book is in very good condition and comes from a non-smoking household