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If the trans is bad, you can bypass with caps and resistors. Look for 511 trans bypass in tech section is where I think I read it. Those trans are high impedance so they can be hard to check with a digital meter. the jack before the second trans is for headphones the one after is for the horn. Batteries should be 5va, (filament) 22, 45, 90vb (first trans, second trans, horn)on the ones I have anyway. Stewart Warner model 300 is a good generic trf schematic.