A cracklin static-like sound at power up

[benindavis]

My 69 Bandmasater Reverb is up an running and sounding good so far now that Ive got my cab built and all .. But...... I noticed when I first fire this baby up it crackles and sounds "staticky" It goes away after a few seconds .. Is it anything I should investigate or does it fall into the range of normal tube amp behavior?
Thanks gang!
Ben

[TD_Madden]

My '68 Bandmaster does the same thing....probably cuased by a worn standby switch.

[Enzo]

SOme tubes make noises as they come up to temperature. As the metal parts expand slightly from the heat, they can move within the structure, and it crackles. I wouldn't worry about it.

[TD_Madden]

much better answer; thanks Enzo!