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oke, you should look in " Circuit Improvements for the Heath SB-220 Amplifier.

there is an article writen by Rich, AG6K everything about the SB220 .

I think you can find all the answers there, if not, there is a group in YAHOO users with a forum, BUT you must have a legal hamcall cause they willnot help you if the think you will use the amp on 11.

personaly I dont mind, cause its your own responsebility, not mine  but with the Ham spirit in mind I help every one I can.

73,s de EA5HIY Johan