Mullard 61SV Vacuum Tube Photo Tube NOS NIB 6550 I just cleaned this four

I just cleaned this four LP set on my VPI 16

They all test on or near the cusp

MOST OF THE ITEMS WE SELL ARE OVER 70 YEARS OLD

46 and 54 where minimum (65%) is 45

Mullard 61SV Vacuum Tube Photo Tube NOS NIB 6550 I just cleaned this fourThis new old stock, new in box Mullard 61SV IR sensitive lead Sulphide photoconductive cell tested to spec on our Paul Hart calibrated TV7 U. It has 93S6 provenance date codes. 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