General Electric GE 6BY5 6BY5GA Vacuum Tube NOS NIB 12AU7WA Bottlehead top filaments for a nice

top filaments for a nice light show (please see Picture Four)

They tested as follows: 56/32

Transconductance measures the efficiency of a tube and also serves as a tube life measurement proxy as tube efficiency diminishes with age

4-17 188-5 and 2-48 188-5 date/provenance codes

I could find precious little information on this two-record set with my baby Russian

General Electric GE 6BY5 6BY5GA Vacuum Tube NOS NIB 12AU7WA Bottlehead top filaments for a niceThis new old stock, new in box GE 6BY5GA 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