6 RCA Radiotron 12SH7 Vacuum Tubes NOS NIB Lot Of Six

6 RCA Radiotron 12SH7 Vacuum Tubes NOS NIB Lot Of SixThis lot of six new old stock, new in box RCA Radiotron 12SH7 tubes 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

new in box Raytheon BH rectifier tube has not been tested yet

These nine TCA UY-224 globe

They have NU 188-5 and 3-09 188-5 date/provenance codes

(New US-made 6V6s typically test with plate current from the mid-teens to mid-thirties with transconductance from 2300 micromhos or so

Transconductance was 1890 for Tube One and 2000 for Tube Two where new/nominal is within one standard deviation of 1900

Sylvania-BRANDED 8BQ5 tube tested to spec on our Paul Hart-calibrated TV7/U

These rectifiers test below the cusp

WE CANNOT TEST FOR CATASTROPHIC FAILURE

new in box Zenith 6AD7G tube tested to spec on our Paul Hart-calibrated TV7/U

These links appear to be made of stainless steel and rose gold

This Ken-Rad 5V4G rectifier tube was tested on our Paul Hart-calibrated TV7/U

This hardcover book is in very good condition and comes from a non-smoking household