Sylvania
NOS In Box Matched Pair Sylvania USA 12X4 Black Plate Top [] Get Vacuum Tubes
- SKU:
- PX1724
- UPC:
- 12X4
- MPN:
- 12X4
- Availability:
- Ships in 1 business day or less.
- Shipping:
- Calculated at Checkout
Description
Tube Type / Number: 12X4
Actual Brand*: Sylvania
Printed Brand: Philco
Quantity of Tubes: Matched Pair
Plate Construction: Black
Getter Construction: Top []
Country of Manufacture: USA
Visible Date Codes: 312 5447 & 312 5648
Lettering Condition: 75 Percent
Year Made:
Mica Spacers: 2
Smoked Glass? No
Engraved Base? No
Boxes Included? 2 Boxes - ONE Original, ONE NOT Original
Notes:
Gm Test Results: 50/50 & 50/50
Minimum Good Value: 40/40
NOS Test Value: 50/50
Life Calculation: 100+% (where 65% = fail)
Tests as NOS?: Yes
True NOS?*: Yes
** 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.