Follow the RF path from the BS170 Q1 to the RF output with a continuity tester. It won't pass the capacitor, so just test the path both sides of the capacitor. If the path is good, then make sure you check the bias of Q1. I measured idle current and just tweaked bias until it was about 5ma higher than idle, and left it, and I'm getting about 350mw out. Plenty good!?
Testing continuity will also check your toroid to make sure that all 4 (if you did the bifilar winding) have continuity. Might not hurt to warm up those solders to be sure you heated the enamel until it burned off. Hope this help! :)
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Ryan Flowers W7RLF
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