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Thanx for your reply, tonejam. :) At the back of my amp there is a labeled SLAVE output socket above it's pot, to it's right a labeled PRESENCE pot and, between it and the three speaker sockets, an unmarked socket. Could this be the preamp bypass input?

I've just bought a Line 6 HD300 and want to use it as a preamp for my 1970s 60 watt Boogie Mk 1, # A652, bypassing the preamp stage so that I can use the power amp only. It has a beige vinyl covered cabinet, a cloth face and is equipped with a 12" Altec-Lansing 417-8H Series II speaker. It's...