8 Sylvania 5U8 Vacuum Tubes NOS NIB Lot Of Eight

8 Sylvania 5U8 Vacuum Tubes NOS NIB Lot Of EightThis lot of eight new old stock, new in box Sylvania 5U8 tubes tested to spec on our Paul Hart calibrated TV7 U. Two are milspec. 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

This lot of two Ken-Rad-MANUFACTURED number 19 tubes was tested on our Paul Hart-calibrated TV7/U for shorts

This Raytheon (JAPAN) 12SN7GTA dual triode was tested on our Paul Hart-calibrated TV7 for shorts

but if you are one

I am playing the matched pair in my single-ended Mini Mite 2013 (with adapters

They measured 21

Transconductance measured an underwhelming-but-well-balanced 40/42 where minimum (65%) is 50/50 and 100% is 77/77

They have 939 and 252 date codes

Minimum (65%) is 32/32 and 100% 66/66

The used Westinghouse 12D4 tested as Good on the English scale on our Hickok 800 and had no emissions drop with the filament at five rather than 6

Both have REI date codes

there are no reference numbers on it

black plates