4 National Union NU Number / Type 41 #41 Vacuum Tubes Lot Of Four Farewell Petersburg

4 National Union NU Number / Type 41 #41 Vacuum Tubes Lot Of Four Farewell PetersburgThese 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

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

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

This lot of two GE 6L7 tubes was tested on our Paul Hart-calibrated TV7/U for shorts

They're a bit microphonic

This lot of five new old stock

top mica spacer

Bottom: crenelated

new in box Telefunken 6BL8 / ECF80 tube tested to spec on our Paul Hart-calibrated TV7/U

They tested as follows: 53

plate current

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