30W toroidal Transformer Power Amplifier Transformer Dual 18V Dual 9V HiFi Audio Power Supply Single-Phase Isolation(Transformer)

https://www.amazon.com/AJDFVHJF-Transformer-Amplifier-Single-Phase-Isolation/dp/B0F99RWL8V?th=1 The problem with switching PSs is the noise they introduce. If the 9V is only for the digital part AND the PS is very high quality, you could try. I would look for a replacement transformer instead (the link above is just the first one I found with a basic search)