amp blowing fuse

Just an update,  Problem was a bad rectifier tube  swapped it out and all seems well. now breaking in my new Tung soul 7581 tubes 

With a tube amp you should always keep the speakers hooked up. You are correct, tube amps need a load or else they can be damaged!

Try powering up without the power tubes, if it stays on, then tubes, if not, something else.

There’s only one fuse externally on the amp. Pretty sure it’s for the tubes. There’s a jewel power indicator lamp that glows for about one second before the fuse blows.  I’m not hearing any noise through the speakers when this happens. You’re saying I should disconnect the speaker wires while experimenting?  I thought that was bad  don’t the amps want to see a load?  There’s also a 6sny7 tube. Could that also cause this?  

which fuse what is?  Was it the AC line fuse in the IEC connector?  If so, a bad tube shouldn't blow that. That's more likely a switching surge issue.  Now if one of the tube fuses blew then yes, sounds like a bad tube.

Yes, bad tubes could cause this. Pull the speaker cables off before you do any more experiments.

Swap out the tubes and you'll know. :)

Best,
E