1 Matched Pair NOS Tung-Sol 5998 421A Tubes. Top and Bottom Getters

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1 Matched Pair NOS Tung-Sol 5998 421A Tubes. Top and Bottom Getters:
$274.00

1 pair of Tung-Sol 5998 421A double triode tubes with original boxes. Boxes are in good shape but missing flaps on both ends.
Tested on a rebuilt and calibrated Heathkit TT-1A mutual conductance tester serviced by c.g. industries.
Tube 1 tested at 15,250 micromhos for both section with a 27 mA and 28 mA plate current draw per section.Tube 2 tested at 14,500 micromhos for section 1 and 15,000 micromhos for section 2 with a 27 mA plate current draw for both sections.
The reject point for this tube is 9,750 micromhos with 15,000 being the average new reading.
No gas or shorts. Strong life testing.
Satisfaction guaranteed. Any issues please contact me directly for a solution.
Free shipping on additional tubes purchased at the same time. Wait for a invoice or I can refund the difference.
Thanks for looking!