Okay, I had a look under the hood, and it looks like it has the regulator circuit on the board. I drew a little schematic of what I saw and am attaching it to this post. Looks like the regulator is an LM317. If need be I can track down a datasheet for this chip, but if you know off the top of your head what voltage I can apply to it, that would be awesome! The battery is labeled UB1213, which google tells me is a 12v, 1.2Ah SLA.
Cheers,
DDC
PS, I'm also attaching a "gut shot" of the whole board. I can't read the name of the amplifier IC, but judging by the size of the heatsink, it's probably a class D chip. Looks like the preamp is built around a TL082 opamp
Cheers,
DDC
PS, I'm also attaching a "gut shot" of the whole board. I can't read the name of the amplifier IC, but judging by the size of the heatsink, it's probably a class D chip. Looks like the preamp is built around a TL082 opamp