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I have gone through the hole chassis and cant find anything amiss. Should there be continuity between the outside of the power ground and the center? The outside connections are the heater wires,the inside the ground and center tap.

I'm not quite sure what yuo mean by inside and outside. But if you're saying that the heater wires are connected to ground then that's wrong. However be real careful of trying to measure continuity involving heater connections, as the PT's heater secondary winding has a very low DC resistance which may fool you into thinking that there's a short (especially if you check with a buzzer), when actually there isn't. How long does the amp run for before it blows a fuse?

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Great tones come in small glass jars!

You may eventually need to disconnect various parts and see if the fuse still blows. e.g. disconnect the board, heaters etc. but there may be a short to ground somewhere. Check the center lugs of any terminal strip in case you connected a hot wire direct to this lug & therefor ground.

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Stephen
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