Found a cheap ($5) stereo audio amplifier on eBay, with the right size speakers and 5V input. Disassembled and installed into the 600XL. Will put a jack eventually on the back, so that a short jumper can run from the output of the Pi to the amplifier (rather than running the input out the back as it is now. Also, the 5VDC input is temporarily off the GPIO header, until the Control Block arrives. Power will then come off the Control Block master.
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