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obviously this sounds like a blown out speaker, but its not.
as some of you know i bought a bassman 10 and it needed loads of work done to it.
all the while the head was beingf worked on i used the speaker cab with my 68 bassman head with no problems when i got the head back i started jamming around on it and noticed it sounded as if one of the speakers was blown, i was suprised becuz i never noticed this before.
i tried plussing it into a carvin 4x12 cab, and then a 2x12 cab and the crackle is still there, but only at higher volumes(anything past about 5)
so i have now determined that the head makes this sound and not the speakers, and before i take it back to indy to get it sorted.
has anyone ever had this sort of problem before? does this make any sense?

my '76 bassman 50 has the same crackle but only after, like you said, about 5 on the master volume
mine could use a re-cap and tube but its still functional. never really bothered me too much since its bedroom levels 80% of the time.

it does have a loose tube socket that causes it to crackle. if i move the tube back in place it stops until it wiggles its way loose.

i just had a load of stuff re-capped and what not. i did end up taking it apart, and swapping out some of the tubes with some other tubes and it was still there. i guess i can try the wiggle trick again, but im thinking its something else.(altho im an amp novice so im not sure at all really)