5E3 blowing fuses

My 5E3 clone has started blowing fuses. What should I be looking at? PT?

Could be a shorted tube.

If you have a light bulb limiter now is a good time to use it ! Beats buying fuses.
Like Refin said a shorted tube I'd start with the rectifier.

Oh is it blowing the fuse right away or does it take a while?

1) pull all tubes, power up, see if fuse blows. if it does stop there you have a problem with line in/PT?etc.

2) if 1 ok then put in rectifier tube and turn on again. if fails likely bad RT.

3) turn B+ on with your standby switch. if fails have to go looking for short (could be bad cap that is now blown/shorted)

that should be enough homework, try that and let us know.

Thanks for the advice, got some stuff to try now.