From the images I have seen, there should be a big heatsink. Assembled TAS5630 High Power Class D Power AMP Board | eBay
I don't think so, feedback resistor divided by grid resistor gives gain for tube, opamp too I guess, but is it feedbackresistor, TI 5630evm surely makes it look that way, so increase gives attenuation, are the opamps active, working? or does signal bypass opamps through feedbackresistor maybe, I really don't know, guessing here. I would create a thread in analog line level with opa1632 in title, circuit is 5630evm, increase feedback resistor gives reduced gain, I could be mixing things up.
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