4 National Union NU Number / Type 41 #41 Vacuum Tubes Lot Of Four Farewell Petersburg They have 4-39 188-5 and

They have 4-39 188-5 and 3-43 188-5 date codes/EIA code

This lot of five new old stock

likely Tung-Sol-MANUFACTURED) measured 33 where minimum (65%) is 22

Transconductance measured 95%/100% for Tube One and 95%/105% for Tube Two

top mica spacer

4 National Union NU Number / Type 41 #41 Vacuum Tubes Lot Of Four Farewell Petersburg They have 4-39 188-5 andThese four National Union type number 41 tubes tested as follows on our Paul Hart calibrated TV7 U: 46, 47, 48 and 48 where minimum (65%) is 40 and 100% is 62. 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