I did your same job you some time ago, when I restored a non working BC-348.

It is very difficult to give you advices by e-mail. The obvious way to proceed is to start from the audio power stage and go up in the chain, checking the wiring and voltages. I found that the wiring had been modified in several places.

Also in my case I had the impression that the crystal filter was not working. Initally I had simply tuned the IF transformers for maximum output. But I then realized that the IF transformers were tuned on a frequency quite far from the crystal resonant frequency (910 KHz). After retuning the IF chain on precisely 910 KHz with the aid of a signal generator the crystal filter started to work normally.

73

Tony I0JX