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Because your electrical system is not going to handle more than a 5 pill without work you probably don't want to do, I think I'd recommend selling the radio and getting something more appropriate for your amp.


While you could bypass the driver in the 667, you'll still have other issues because the attenuation resistors they use on the input of this amp to control the power stages would also have to be bypassed to take the drive we are talking about.


You're not going to be happy trying to make the radio work without its internal amp. You already know this radio does not perform like all other single final radios because the circuit was designed to work with two. As such, the impedances are matched much lower than what is required for one.


They didn't fix this problem at the factory because crippling the radios output was the whole idea to drive the internal amp. It will also not be easy to just add the second final. Matching the existing parts is not likely and two new transistors with associated caps should be installed in this case.