Replace AC tranny for a DC adapter?

[martaine2005]

Hi guys, just joined as I am learning electronics as a NOOB!!
The Question.
Can I replace an internal 220v-9v .5A tranny with an external DC 9v-1.5A adapter?
Obviously it can be done, but I am a little confused as the pcb is already full wave rectified.
So, with a 9v DC adapter going through the bridge rectifier and 2200uf smoothing cap, will it be rectified again..smoothed again? Sorry don't have a scope only a Fluke 7-600.
Also, would there be a polarity issue with the adapter and rectifier?
Hope this makes sense and thank you in advance for any answers..Martin.

EDIT: I have already done this and the speakers work but seem to have distortion on higher volume. Hence the original question. I know the higher amperage wont pose an issue too.

[Pauldf]

In theory there isn't much stopping you from doing this, the only issue may be the two rectifiers zapping 1.4v each so the voltage may be a tad on the low side. Some cheap adaptors don't have smoothing in them either.
Easiest way to see is stick a fluke across the cap and see what dc voltage you have. If the old transformer was 9vAC RMS (around 70%) then you may expect slightly higher than 9v at the capacitor.