my preamp wont power up

If the tube preamp has a tube rectified power supply, then indeed there are tubes in the power section. ARC has used 6L6, 6550, 5AR4, and a few others in their preamps.

The ARC REF5 uses a 6550.

It's a fuse you didn't see somewhere, the circuit is no longer a circuit.

There should be internal power supply fuse than. Also rectifier tube has to be inspected again.
It seems that tubes in ARC last substantially shorter vs. other tube amps/preamps.

Yes,ive tried different tubes.there is a external and internal fuse,theyre ok.Unless there is another one somewhere

Check to see if the line has a ground fault protection duplex on it. Could be in the kitchen or bathroom.
There's a chance it tripped and should be reset.