Re: Clumsy Quad 2 error
The crud is unlikely to be the problem. The choke is potted in bitumen and the lighter components of this can seep out around the turret base. Solder flux can also look dark like that.
Normally the power connector (I take it you mean the 2-pin Bulgin mains connector) has screw connections to the terminals, not solder. Is that the connector you've been working on ?
Cheers,
GJ
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