One, new in box, RCA branded, Mullard made 5AR4/GZ34, Grey plates, f32 construction, 7 notch plates, "GT BRITAIN". Tested on a Hickok TV-3 military tester that has been calibrated, just to make sure. Firm base, excellent silvering. Tube tests at 170-168 where pass/fail is 80. These are relative numbers and do not indicate percentages. The tube has the etched date code of "f32 B9F2", manufactured at the Mullard Blackburn factory in March 1969.  The tube has the printed date code of "CY.", branded by RCA in June 1970, with the period, ".", in the date code, indicating that another manufacturers tube was rebranded by RCA.

Many other lots of tubes for sale this week.