![]() The only time that I've used the amp is doing AM stuff with the ricebox, in this case, the Kenwood TS-2000X. Hey Robrich: Boomer let me know that ya asked if I did a tube swap, yet, in my AL-811A amp to 572's. Perhaps even more affordable and readily available would be like a couple of 811a tubes in grounded-grid running say 200-300 watts PEP. ![]() ![]() The GI-7B tube used to be popular for homebrew amps up to a few hundred watts, but I am not sure anymore. Perhaps a better bet for what you are seeking would be a starting with a monoband homebrew HF tube amp from the multitude of project guides from over the years. Then there is the potentially questionable IMD even if filtering is applied. Usually not even a basic lowpass filter, a huge YMMV putting a potential "splatter box" on the air without adding the cost and time to build a filter network. The bigger problem is the tendency to have no output filtering. Expect poor to even no real documentation, though guides by actual kit builders should be available. There are several inexpensive "Chineseium" 25w-50w kits floating around Amazon, eBay, etc. Scaling down, the Hardrock-50 comes to mind. The Mercury III kit is quite popular, but it is a modern 1200w LDMOS amp kit costing ~$2500. These days the popular kits seem to be larger solid-state amps.
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