[morzh]

And?

I mean, what is the question(s)?

Meantime, there isn't much to it, so if you have distortion (BTW what kind distortion?) - start with C1 electrolytic cap. May need to go. Unlike in tubes' schematics, it does not present any danger but might become leaky over time.
Check your batteries and your batter holders.
And check your speaker.

And if all checks out, your crystal pickup might be...worn out. Those used to cost pennies and sold separately. They (at least those I knew) were simply taken out by pulling them by the handle rotating it 90 degrees first and then the new one would go in in the reverse order. Took 30 seconds.

And, don't expect whole lot of quality sound out of this one. Asymmetric CLASS B output.....one is a follower, another is a Common Emitter......

BTW I believe they made a mistake in description saying all three transistors are "common emitter" - the lower L5022 is the emitter follower (common collector).


PS> BTW they have the troubleshooting right there in the manual. You need a scope for that but simply pulling and replacing transistors if you suspect them is easy.
I do not think you will have trouble with transformers - they are not subjected to any particular stress.