Dunlap Clarke Model Ten Preamp

Start with the power supply. Any DC voltages present?
If not, any AC voltages on the transformer secondary?
If not, any AC voltage on the transformer primary?
Some small transformers have an internal fuse.
If you don't have a DVM, go to a tech instead.
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I suppose what is needed here is a schematic. I have checked for cold solder joints, but it is not impossible I have missed one. This preamp is a little different in my experience. There was some thought on doing some things differently. For example there are two balance controls, one for the Left and one for the right.