Mullard 61SV Vacuum Tube Photo Tube NOS NIB 6550

Mullard 61SV Vacuum Tube Photo Tube NOS NIB 6550This 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

This is a late-40s pressing with some scratches and moderate surface noise

52 and 60 where minimum (65%) is 36 and 100% is 55

These nine TCA UY-224 globe

This Sylvania 6B4G tubes was tested on our Hickok Paul Hart-calibrated TV7/U for transconductance

I just cleaned this four LP set on my VPI 16

incredibly-super-rare

Tube Two: 22

They all test on or near the cusp

These tubes have anode radiators for cooler operation and longer tube life

new in box Trigon UCH81 tube tested to spec on our Paul Hart-calibrated TV7/U

MOST OF THE ITEMS WE SELL ARE OVER 70 YEARS OLD

46 and 54 where minimum (65%) is 45