My EP-AB003 "8W" amplifier works but only has 11.5dB gain as opposed to the claimed 17dB so I get +29.1dBm out for +17.6dBm in. At the moment I don't have more drive available to see if I get more power output for more input. Lack of output power seems to be a common but not universal complaint about these units.
Anyway, I took the lid off and have noticed that there are some suspicious white blobs of what looks like foam on some pins of the device associated with the output combining and also two pins may have a solder bridge:
Is the white stuff just flux residue or were those areas not actually soldered? I assume(!) that the white blobs at the two corners of the device are not actually pins so only the middle left hand side blob is important. I'm going to need to buy a much finer soldering iron, steadier hands and better eyesight if this needs reworking
Does anyone know what the device is? I searched on the "2031 1RNT" but couldn't find anything relevant.