I did remove all the tubes and same thing happened, the fuse blew. I didn’t even have to apply a signal. Neither the guitar or speakers were plugged in, tone and volume were turned all the way down.

The polarity of the filter caps should be ok as well, have been checking and rechecking the schematic over and over again. I haven’t noticed any smell coming out of the amp during operation or when the fuse started to blow. Sadness :(

Now I’m out of fuses and wont be able to perform much troubleshooting until next week.

Thanks for the tips Robin.