General Electric GE 21JS6 21JS6A 23JS6 23JS6GA Vacuum Tube Valve NOS NIB New York Times This pressing has very light

This pressing has very light surface noise

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

Tube Two probably has a piece of broken glass in it

Transconductance readings are 44

steel plates and a top

General Electric GE 21JS6 21JS6A 23JS6 23JS6GA Vacuum Tube Valve NOS NIB New York Times This pressing has very lightThis new old stock, new in box GE 21JS6A 23JS6GA 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