There are two types of solder flux. The old rosin-core flux is inert.
The newer organic flux is corrosive and would result in the sort of damage described in this clock. It needs to be washed off in hot water soon after use.
On 12/18/14 9:39 PM, Nicholas Stock wrote:
The solder flux won't do anything untoward in my experience. I still have amplifiers I put together over 25 years ago without cleaning the flux off them and they work fine...if it bothers you so much, take the tubes out and the PCB from the case and get an old toothbrush, some isopropyl alcohol and gently scrub the stuff away and wash with fresh isopropyl alcohol afterwards. It'll take a few go's to get it nice and clean.
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