General Electric GE 25BK5 Vacuum Tube Valve NOS NIB 5U8 Nonal T23 new in box Mullard 61SV

new in box Mullard 61SV IR--sensitive lead Sulphide photoconductive cell tested to spec on our Paul Hart-calibrated TV7/U

External Diameter: +/- 21 MM

Transconductance was 1620 for Tube One and 1730 for Tube Two where new/nominal is within one standard deviation of 1900

They have E5E and E5E date codes

Transconductance was 1710 for Tube One and 1960 for Tube Two where new/nominal is within one standard deviation of 1900

General Electric GE 25BK5 Vacuum Tube Valve NOS NIB 5U8 Nonal T23 new in box Mullard 61SVThis new old stock, new in box GE 25BK5 tube tested to spec on our Paul Hart calibrated TV7 U. BECAUSE OF THE BIZARRE, INTRUSIVE, CRUEL AND DRACONIAN GERMAN PACKAGING REGULATIONS AND THE SEVERE FINES AND PRIVACY INTRUSIONS ASSOCIATED WITH THEM WE NO LONGER SHIP TO GERMAN ADDRESSES. WE WILL HAPPILY SEND YOUR PACKAGE TO A NEIGHBORING COUNTRY OR MAKE SUITABLE ARRANGEMENTS. IN 2021 WE PURCHASED 150,000 VACUUM TUBES. IF IT'S NOT LISTED, WE PROBABLY HAVE