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Next place to check is the phono connectors on the phono amp. They are renowned for developing faults. Sometimes interconnects have slightly varying pin sizes and weights of cable+connector can make a difference. Could be cold solder joint or wear and tear in the connectors.
It's a pre and power amp but yeah, I'm basically expecting dry solder and/or worn RCA connectors on both amps. I'll have all the caps replaced at the same time to be safe. The confusing thing is that when you look in to the different test scenarios, the results don't actually make much sense other than there must be several problems overlaying each other. It's useful to have a reference point s0 I can test them after they've been serviced.
I spent an hour this morning beforehand cleaning the interconnect plugs with alcohol (Lidl's finest Gin as I didn't have any contact cleaner).
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freddo
Next place to check is the phono connectors on the phono amp. They are renowned for developing faults. Sometimes interconnects have slightly varying pin sizes and weights of cable+connector can make a difference. Could be cold solder joint or wear and tear in the connectors.