Intermittent Crackles and Pops

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I recently acquired a vintage PHILIPS B6X44a, I believe from the early 1960s. While the set plays well, all lights work, no static issues with controls, I do get intermittent crackles and pops on both FM and AM bands. I am a total novice at this so I wonder if someone can give me advice on what this issue might be and how I can troubleshoot it. Appreciate any help you can provide.