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Ameritron fully supports those amps too and has all the parts needed if you get one that is DOA.  Worst case, if you can't fix it by calling them and troubleshooting it yourself, you can send it in to them for repair.


Best bet on a used amp is to buy from someone you know or are referred to by someone you know.  Otherwise, next best is to go to the seller and test the amp before you pay them for it.  Make sure it loads up and does what it is spec'd to do.


I picked up an AL-80B used, it's another great amp but worth more money.  If you are patient you can find them for $750 or so, less patient, more like $900.  Very rugged design and relatively simple inside.  They'll give you a kW or so reliably with a bit less than 100W drive.