1x One 1998 TV7D/U TESTS NOS/NIB UNUSED 572B Penta Laboratories Triode Tube 811A

Description

1x (One Tube/ Valve) TV7D/U TESTED Vintage 1998 NOS/NIB UNUSED
572B Penta Laboratories Power Triode Vacuum Tube
(Please see all pics)
Condition : Unused New Old Stock from 1998 production, New Condition in the Original Penta Labs box.
Date code stamped on the original box  and also ink stamped on glass "98 45". This tube passed Filament Continuity test and  calibrated TV7D/U tested
with
NO Shorts, NO Leakage, NO Gas.
Calibrated TV7D/U Tested at:
68/36=min 65% tube life. a TV7 meter reading of 68 = 1,700 Gm, where 36=900 Gm is minimum 65% tube life .
This tube was in a very large lot of Transmitting tubes we purchased from a Defense Contractors Electronic Surplus sale. We are currently listing many vintage NOS/NIB AF/RF Transmitting Ham and Commercial Broadcasting vacuum tubes on ebay. Please see out other listings.
RETURNS ACCEPTED if not Delighted , FULL 30 day Operating Warrantee / Guarantee  on this tube.
The tube has been tested and passed for Filament continuity, Our Calibrated Hickok TV7D/U and 752A does not list
data setting for this 572B tube but we used the 811A data settings are our test setup parameters.
This tube tested NO Shorts, NO Leakage, NO Gas
At the 811A settings this tube tested VERY STRONG as an NOS Tube. We are unable to test the exact full strength for Gm Transconductance & mA Plate Current results. Best to Test RF power Amplifier tubes in -circuit for
tube quality. Again FULL 30 day
Operating Warrantee / Guarantee  on this tube.
Note: The original factory
Warrantee on this tube was 13months from the manufacturer Penta Labs.
Details: '
The Penta Laboratories is a power triode designed for use as a RF Oscillator, RF Power Amplifier and audio frequency modulator. The 572B is a direct replacement for the 811A, but has a graphite anode for increased performance and reliability."
All Penta Laboratories tubes are burned in before testing and matching at testing facility in Ventura, California.