Allison Coss and Scott Sippola were arrested in December (09) after they threatened to release incriminating snaps of the actor unless he handed over $680,000 (£453,000).
Last week (15Jul10), Coss, 24, and Sippola, 31, were found guilty of conspiracy and using emails to threaten a person's reputation.
The former E.R. star is delighted with the verdict, but admits the trial was gruelling.
And he reveals he got through the trial's darkest moments with the help of the Beach Boys - a band he frequently drums with at special shows and charity events.
He tells Eonline.com, "You know when you're at the dentist and they tell you to think of happy thoughts? Or, if you're in a situation that is not so happy? Well, my happy thoughts last week were Beach Boys. I was thinking of playing music. There is nothing more cathartic for me and nothing makes me more happy than to get behind the drums and play.
So when I got home (from the trial), I immediately cleared my schedule (for a Beach Boys tour)."
Stamos will hit the road with the Good Vibrations hitmakers later this week (22Jul10) for a string of dates that mark the 25th year since he started playing with the band.