Thanks for the suggestion Howard, I'll try that. BTW, does anyone know about applying current FB? I've nicked a few ideas off this chaps build -
http://www.turneraudio.com.au/100w-monobloc3-2014.html he used current FB in his similar amp.
Thanks for your kind words Al. The "speaker" I'm using is a 100w Celestion C15 15" woofer in a guitar cab, a Celestion 10" speaker cab as mid, and a Fane 140w horn cab, connected to an old Kef X over. this lash up sounds better than my "hifi" speakers. Yeh, reggae sounds especially juicey.
A.