Bad rectifier tube in a Deluxe reverb?

I was experiencing some crackling and fuzzing noises in my 67 deluxe reverb, and trying to track it down. So today I swapped the rectifier tube which seemed at first to fix the problem. Sounded better on the first power up. However, the next time I fired it up, I got a strange buzzing sound when I turned on the power switch but before I turned the standby switch on. I was a little bewildered and I *think* I turned the standby on which blew the fuse.

Does that sound like a bad rectifier tube? I've never heard an amp buzz with the standby off before...Anyone have experience they'd like to share?


Btw, the filter caps have been changed.

 

Thanks guys. I will get some more fuses and try again.

 

Update:

I finally got around to buying some more fuses at radioshack and was able to try again this afternoon. I'm not sure it was a great idea, but I decided to retry the rectifier tube in question. This time I was facing the back of the amp and saw the fireworks going on in the Rectifier and quickly shut the amp off. So yeah, definitely a bad Rectifier tube. A brand new (by the looks of it), never tested, Mullard GZ34 too. Oh well, bad luck.

After swapping another GZ34 in there, the amp is back in good running shape so I can't really complain.