NOS NIB Ip Matched Quad (4) Original Genalex GOLD LION KT88 [6550] Vacuum Tubes

Tube Type / Number: KT88 [6550]
Actual Brand*: Genalex Gold Lion
Printed Brand: Genalex Gold Lion
Quantity: 4 Pieces - Matched Quad
Matching Date Codes? No
Plate Construction: Black
Getter Construction: 3 O
Country of Manufacture: England
Visible Date Codes: None
Lettering Condition: 100 Percent
Number of Mica Spacers: 2
Mica Spacer Shape: 
Glass Coating: Clear
Engraved Base? No
Boxes (always included): All Original
Notes:

Absolutely stunning tubes. Two of these were factory matched by Genalex and are taped together with "Factory Matched" tape.

The getter flashing is solid on all four tubes. Two of them have a very light coloring / rainbow effect which usually indicates wear, but these test as brand new and were purchased from one owner. 

Tested For & Matched By: Plate Current (Ip) & General Mutual Transconductance (Gm)

Plate Current Test Results: 45.5 Ma & 46.5 Ma & 49.5 Ma & 44.2 Ma @ 400 VDC 

General Mutual Transconductance Test Results: 5020 & 4730 & 5120 & 4860

Minimum Good Value: 2600
NOS Test Value: 4000

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.