[MrFixr55]

Sorry, I did not see your post as I was writing mine. I would think that with a consumer electronics level Aux input of about 300mV, the output of the radio should be quite loud. The schematic rates this radio at 7W. However, if the amp sounds good and can be made much louder than you desire, the amp is good.

This radio requires a long wire antenna. If you have other radios of a similar vintage that also require an external antenna, this radio should be as sensitive as your other radios. By this, I don't necessarily mean how far the volume control needs to be turned; this radio should receive as many stations as the others and, unless the station is extremely weak, the stations should be te same volume.

This is a longshot but check out the muting switch, #71 and ensure that nothing has carbonized, causing a leak to ground.