I have a Danelectro Nifty Fifty 15 watt solid state amp that I really like the tone and think it's quite amazing for a little practice amp. It recently developed a crackle sound which I thought was the speaker so I replaced the speaker. But it still has the crackle sound. Does anybody have any ideas how I can salvage this tiny yet amazing amp? I've heard it's very expensive to have it repaired so if there's anything I could do myself I am pretty handy with a soldering iron. Thanks!