And fixed.
Problem? I am running a 7805 for logic and a 7809 for pa. There is a 4700uf electrolytic across the input, 0.33uf caps on both input leads to regulators and 0.1uf caps on the outputs. In sheer desperation I removed the output cap from the 7805. U3s is now sat there chuckling away and chucking out rf into a dummy load.
Thanks for all the input, especially Mike Pencoys.
Off for coffee, Christmas cake and a hair Transplant.
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