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There's only one way to check the transformer and that's with a voltmeter. If there is mains going in but nothing coming out of the secondary, then that fuse has gone. They are not designed to be replaced and Transformers are what the trade call 'Safety Parts'. So they have to be replaced with the same thing. I would contact Teac and find out if they still do make them or where you can get one from.
I know this thread is a couple of years old, but this may help someone with the same problem. There doesn't seem to be a supply of A-H300 transformers for direct replacement, but you can utilise the transformer from the MKII version of the amplifier with a little modification. The output voltages from the MKII transformer are exactly the same, but two of the connectors have changed, so you will need to salvage these connectors from the original transformer to modify the MKII version. The physical size is also a little different, but it will fit. I found that I had to remove the excess 'tags' that remain on the lower circuit board to give enough space for the transformer to align with two of the original mounting holes & I drilled one extra hole in the replacement tranformer baseplate so that a third screw could be used. Hope this helps someone!
The problem is not the transformer. You now have shorted output transistors at the very least. By corssing the wires you presented a zero(0) ohm impedence load to the output section. It quickly went into overload. Before the fuses had a chance to open up, the outputs fried. This unit will require new output transistors and perhaps the previous driver circuit will require parts as well. Figure on $20-$50 in parts plus hte local labor rate for the repair.