General Electric GE 6BY5 6BY5GA Vacuum Tube NOS NIB 12AU7WA Bottlehead 4-17 188-5 and 2-48 188-5

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

This matched pair of RCA 6X5GT rectifier tubes was tested on our Paul Hart-calibrated TV7/U for shorts

Transconductance measured 38/41 for Tube One and 42/41 for Tube Two (RCA-LABELED) where minimum (65%) is 32/32

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

Tubes Three and Four measured 84/80 and 81/85

General Electric GE 6BY5 6BY5GA Vacuum Tube NOS NIB 12AU7WA Bottlehead 4-17 188-5 and 2-48 188-5This 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