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dbx 386 Power Transformer

Hi there! I have a dbx 386 dual channel tube preamp. It was out of service for some time and when I recently put it back in the rack only a couple of LEDs turn on. On inspection it seems that the larger of the two transformers supplying power to the PCB has transformed into a Gandalf No-Pass Filter ("None shall pass!"), i.e. voltage in to the transformer is good, voltage out is 0.

Toroidal Transformers

Toroidal Transformers -
A transformer in the shape of doughnut. Although costlier to produce and tends to be larger and heavier than other forms of transformers, the shape reduces magnetic fields entering or leaving the transformer, and thus makes it desirable for high-end audio applications.