Retubed my amp and.....

[Yo Daddy]

Now there's a loud popping sound. I isolated it to the amp itself by disconnecting the rack and changing the instrument cable.

I made sure the bias switch was changed over.

What the hell is going on here?

[Lord Raptor Jesus]

Well the common sense things.

1. Did you rebias (only applies if you actually do have to rebias).

2.Did you put the correct tubes in?

3. Your guitar cable goes in the amp. Not your penis.

[Yo Daddy]

Is that why I'm getting the popping? Naughty penis!!!!!!

I have to just throw a switch for the bias. I went back to EL34s from 6L6s.

There was an old set of tubes that had only an hour on them so I threw 'em in. No more popping. Maybe one of the tubes were bad? They were matched so who knows WTF happened.

[KH Guitar Freak]

I assume it's only when you turn it on, and doesn't happen in other cases such as changing channels???

[jet66]

There was an old set of tubes that had only an hour on them so I threw 'em in. No more popping. Maybe one of the tubes were bad? They were matched so who knows WTF happened.
Are both the old (that you just threw in) and new the same type of tubes, i.e. EL34's? If so, then yep, sounds like you got a bad tube.

If the old tubes you put in were 6L6's then it would either be that one of the new EL34's is bad, or there is something wrong with the self-biasing components for the EL34 config in the amp.