General Electric GE 3DF3 3DF3A Vacuum Tube Valve NOS NIB

General Electric GE 3DF3 3DF3A Vacuum Tube Valve NOS NIBThis new old stock, new in box GE 3DF3A tube tested to spec on our Paul Hart calibrated TV7 U. 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 FORMS OF SHIPPING EXCEPT MEDIA MAIL ARE AUTOMATICALLY INSURED UP TO $100. ETSY PURCHASE PROTECTION COVERS ITEMS UP TO $250 IN

new in box US-made 3A3 / 3A3A / 3A3C / 3AW3 / 3B2 tubes tested to spec on our Paul Hart-calibrated TV7/U

I played them in my Alan Eaton single-ended 45 amplifier (as an "excellent" 6SN7 substitute according to Antique Electronic Supply's "Tube Substitution Guidebook") and they sound outstanding

6 volt tubes

Transconductance measured 35 for Tube One and 36 for Tube Two where minimum (65%) is 25 and 100% is 38

a fence-like strip on top of the top spacer and dimpled sheet getters

This perfectly-matched quintet of new old stock-testing Sylvania-MANUFACTURED 7A7 tubes was tested on our Hickok 800 for shorts

31 and 39 where minimum (65%) is 23

MANY COUNTRIES DO NOT HAVE INTERNAL TRACKING

new in box RCA 6BQ7 6BQ7A tube tested to spec on our Hickok 800

It measured 62 where minimum (65%) is 40

new in box Japanese-made 26LX6 tube tested to spec on our Paul Hart-calibrated TV7/U

top D getters and good flashing