[Tube Radio]

To make it more Hi-FI remove R11, C18, and C29. You may have to add a tweeter to get any decent HF response as those type speakers do not have very good HF response. Also increase the size of C26 and C28 to .1uf. The origional speaker should have excellent low frequency response. I would advise keeping the origional speaker for when (not if) you revert the console back to origional. Been down that road with my K-80 console and after around $50.00 later I have the console pretty much back origional. I didn't keep the origional working speaker when I tried to make mine HI-FI which IMHO was a waste of time to try and do that, but if you do it and like how it sounds when you are finished then that's all that matters. I don't know if this is true with your console since yours has a single output tube, but in mine which has push-pull audio I got feedback when I removed the caps I mentioned and had the tone control/input selector set for max HF response when I turned the volume control up past halfway.