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It'll need one hell of a big one. My Kenwood TS480 running 200W draws 41A.
In regards to the difference between the 350W of the Magnum and the 200W of the Galaxy, it is half a S point to the receiving station. You have to decide whether all the cost and hassle of the extra power is worth it as you could be looking at replacing/redoing absolutely everything except the antenna. If there's any weaknesses at all especially in the antenna install, 350W will show it up.
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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