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I like basket cases the most: there's more to do, more fun to have. Notice on the schematic, this being a battery set, that maximum power output is 0.25 watt undistorted. The set needs an efficient speaker. I would change the speaker board and put an 8" speaker in this, since it was an option per the parts list. You would want a "standard replacement" 8" of the type used in consumer radios, TV's, phonos, not a "hi-fi" one with high compliance cone as is commonly available now. The latter type speaker tends to be less sensitive and requires more power to operate satisfactorily.
Once you have the radio operating, you could try bridging larger caps across the audio coupling capacitors C11, C14, C15, C17, for more bass. Too large and the amp would be overloaded and distort. It isn't going to be a thumper, but with a more modern speaker in it the amplifier could be restricting the low end. Trial and error on those caps to find the best compromise of sound vs power output.
Reece
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Reece
Perfection is hard to reach with a screwdriver.
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