4 National Union NU Number / Type 41 #41 Vacuum Tubes Lot Of Four Farewell Petersburg They're a bit microphonic

They're a bit microphonic

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

They tested as follows: 53

Zenith-LABELED 6C8G dual triode was tested on our Paul Hart-calibrated for shorts

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

4 National Union NU Number / Type 41 #41 Vacuum Tubes Lot Of Four Farewell Petersburg They're a bit microphonicThese 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