A '74 JMP has come in for a check over and necessary restoration work. It hadn’t been turned on for 10 years!! Terrible 100hz (120hz) mains hum, with an interesting resolution!
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0:00 Intro
1:51 Play in - completed amp
3:07 First inspection
10:43 More tones of the restored amp
11:57 Exploring further
14:43 The dreaded mains hum
18:21 Recapped but still hums!
20:56 Finding the issue…choke!!
31:23 Play out