I've never had a problem driving any of four MLA 2500's to 1500W output with a 930S, IC765, or FT1000MP. None had the external tuned input circuit once offered by Dentron. JACK W1WEF -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com Problems: owner-amps@contesting.com Search: http://www.contesting.com/km9p/search.htm