KenO schrieb:
Was asked to find out what AC power adapter would work for a Sony Water Resistant Sports AM/FM Cassette Recorder Model CFS 902.

[...]

Am interested in any suggestions in choosing an AC adapter for this Sony portable.

9 V / 500 mA seems okay:

http://www.bilder-hochladen.net/files/12b4-98-bc6d.jpg

HTH

Reinhard