I am repurposing a 1940’s AM Receiver and Phonograph, using the original cabinet and a new turntable.  I have no use for the AM receiver though, plus it expects a crystal cartridge signal and my new turntable has line level outputs. But I want to keep the receiver in place for aesthetic purposes.  It has a 2-pole 4-position selector switch that I can use to select between the phono and the bluetooth sources.  I can install the Drok amp in place of the Volume/Power switch location in the original chassis, and would like the bluetooth to get powered up when I turn on the amp.  I would think there would be some point on the amp circuit board where I could tap off a switched power source.   I will just need a small wattage amp to drive a single 5-inch speaker, so the 5W + 5W module should work.

Any suggestions on how to do this with the Drok amp and one of their bluetooth modules?