Peavey Delta Blues popping sound

[OldFarb]

My Delta Blues, very similar to the Classic 30, makes a popping sound through the speakers when I turn it on or off (two pops if I have the drive channel selected). It doesn't pop if I leave my guitar plugged in and turn it off, but it does pop if I unplug the guitar.
It is stock, I tried swapping tubes to no avail.
Any ideas?

[Enzo]

Lots and lots and lots of amps pop at power on/off. it is not a defect, it is not a bad tube. it is the amplifier amplifying the spark in the power switch while there is still a charge in the power supply. And as other things charge and discharge, momentary flows of current result in the sound yuo hear.

If the guitar makes a difference, it is possible the input jack grounding contact is not 100%.


Also usually helps to turn the reverb down first, as it is another sensitive gain stage.

Except for the added trem, the Delta BLues and C30 are identical amps.

[OldFarb]

Enzo,
Thanks, but I don't have the same issue with my Classic 30. I'm going to trade for another amp and wanted to make sure this one was ok. It plays/sounds great, just that pop.

[Amp Kat]

I've seen C-30's that pop worst than the DB ever thought it could. On Steve Ahola's site at the blueguitar mods .com he has a mod that uses a 2meg resistor from I believe the relay to ground and it stops all of the popping when switching channels and turning the amp off. Of course as Enzo pointed out if there is a bad jack ,connection or ect...., that's another story but between Steve and Enzo's C-30 mods those amps become some damn nice sounding little monsters and perform quite well after all the mods are complete. I just did a C-30 for a bud and he loves it. Of course we also took the Blue Marvel out and put a Blue Dog in it.