Jon Gosselin: My Friday's Checks Go to Charity ... Or At Least They DID

Jon Gosselin is proud of the work he puts in at T.G.I. Friday's, and says he donated his pay to multiple charities.

Jon went on the "Kannon and Sybil" radio show Wednesday in Dallas and was pissed his cover was blown. TMZ broke the story ... he's been clocking in at a Friday's in Lancaster, PA.

Check out the audio ... Jon's clearly frustrated and says he's calling it quits. For him, it's a trust issue with his co-workers. That being said, he also says he loves the gig.

Sources at the restaurant tell us Jon hasn't said anything about quitting -- he only requested a week off. We're told he'll be back in the kitchen after his vacay.