The amp, when hit with a big transient, sometimes starts buzzing/humming really loud.  When this happens, no guitar signal comes through.  Also, the volume knob on the amp does not change the hum.... so I assume the issue is further in the signal chain.  
Anyone have any ideas where I should start?  Also, this is a PCB amp.  I have never worked with PCB before.  Is there anythings I should do differently with PCB, such as soldering/
			
			
									
									
						Bad Random Buzz/hum from Blues Junior
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