[sdiy] strange PCB faults, was:OTA question

[Graham Atkins]

On 17 Sep 2010, at 15:51, Harry Bissell wrote:

> Electolytic capaciotrs don't usually leak. They dry up and then
> pop.  If you didn't see a blown open can, or one that is bulging at'
> the top (or ends) its probably not the source.

I have seen electrolytics leak. There is a known flaw on the Quad 34
pre-amplifier. The capacitors they used for AC coupling leak down
the legs onto the PCB pads. This causes corrosion and has been
known to cause joint "failure" in worst cases. You have to desolder
and scrape the pads before re-tin and repair.

Graham