NOS VINTAGE 1960 Mullard Blackburn 12AX7 ECC83 Gray Plate I61 Vacuum Tube

Tube Type / Number: 12AX7
Actual Brand*: Mullard
Printed Brand: Mullard
Quantity: 1 Pieces - Single
Matching Date Codes? 
Plate Construction: Gray
Getter Construction: Top O
Country of Manufacture: Great Britain
Visible Date Codes: I61 B010
Lettering Condition: 100 Percent
Number of Mica Spacers: 2
Mica Spacer Shape: O
Glass Coating: None
Engraved Base? No
Boxes (always included): Generic White Boxes - These Came in a Military Bulk Pack
Notes: Date codes point to 1960 as the production year.

Testing: We have multiples of these in stock and therefore are not listing the test results here. All of these have been tested at real world voltage on a Maxi-Preamp tester for both Gain and Gm. We guarantee that these will test at or above NOS values. These are truly NOS tubes with no hours on them.

** Please note, many tubes will test NOS but will actually have a few hours of use on them. A truly NOS tube will have excellent getter flashing condition, no dirt/grime, usually in the original box, and no filament deposits. If a tube is listed  as "tests NOS" but is listed as "not True NOS" please expect the tube to have a small amount of use * 

All tubes have been tested using only the best tube testers. We have a large fleet of tube testers, and every single one of them has been calibrated within the last year by industry experts. We mainly use the Hickok TV-7D/U, but occasionally we may use a Hickok 539, 533A, or 600A.