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A pair of 572B's should not even require 100 watts for full output. I wouldn't run over 100 watts into it. Of course if this is for CB then that's another story. Everybody knows that the basic laws of physics and electrical laws in general do not apply when operating between 26 and 28 MHz.
LMAO!! I was thinking the same thing CK!!! I have a Yaesu FL-2100B with the 572b tubes and I drive mine with 60 watts now yo can drive the amplifier with a Maximum of 100 watts but dont expect to see alot more wattage from the amplifier and if you do drive it at 100 watts be sure to get yourself another set of 572B tubes right away to avoid any delay of the tube replacement because of waiting for the new ones to arrive.
These are great tubes but like anything else if you drive the $h!+ out of them dont expect the reliability Ive seen from mine so far 6-7 years and still going strong on 80-10 meters.
2022 Aug 08 0839 UTC EXTENDED WARNING: Geomagnetic K-index of 5 expected Extension to Serial Number: 1656 Valid From: 2022 Aug 07 1428 UTC ... Now Valid Until: 2022 Aug 08 1500 UTC ...Warning Condition: Persistence
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Spacecraft - Minor impact on satellite operations possible. Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
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