null
National Union

NOS NIB Matched Pair National Union NU USA 25Z6GT Black Plate Vacuum Tubes

(No reviews yet) Write a Review
SKU:
PH1514
UPC:
National Union NU 25Z6
MPN:
National Union NU 25Z6
Availability:
Ships in 1 business day or less.
Shipping:
Calculated at Checkout
On Sale
Now: $8.85
Was: $14.75

Out of stock

Description

Tube Type / Number: 25Z6GT
Actual Brand*: National Union NU
Printed Brand: NU
Quantity of Tubes: Matched Pair
Plate Construction: Black
Getter Construction: Bottom D Foil
Country of Manufacture: USA
Visible Date Codes: 5339 & 5152
Lettering Condition: 90 Percent
Year Made:
Number of Mica Spacers: 2
Mica Shape: Rectangle Saw
Smoked Glass? Clear
Engraved Base? No
Boxes Included? Multiple Boxes - SOME Original, Some Generic
Notes:

Gm Test Results: 750/750 & 750/750

Minimum Good Value: 650/650
NOS Test Value: 750/750
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.

Returns

All of our tubes are 100% guaranteed to arrive as described, test as described and to be void of any sound defects. We offer a 30 day return window from the day you receive the item.

PLEASE NOTE - While we accept returns for basically any fault, we DO NOT accept returns for buyer's remorse which includes buyers who decide they don't like the subjective tonal signature of a tube. We have had people exploit our generous return policy to tube roll on our dime so we have a strict policy against this behavior.

View AllClose

Additional Information

Item Type:
Vacuum Tubes
Production Era:
Vintage & NOS
View AllClose
a { text-decoration: none; }