I would check a few of the old caps in the RX audio and demod. sections.
As Steve( WIK )mentioned, no such animal as a crappy sounding Drake.
You could just "Shot Gun" fix the rig. Replace all tubes, and caps.
in the supected sections.
How good or bad a rig sounds can be ultra conversational.
We have Tube vs DSP technology. We do not have a rig as a standard.
It is kind of hard to diagnose. For a Quick fix, you cannot do any harm by trying a few 3inch dia min.4 ohm magnet speakers. Their diaphram muct not have any tears or holes in it(((