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Posts by MisterX

Fix the grounding. Detailed troubleshooting without a schematic and photos is nearly impossible and typically = a headache for the readers.
Charge pump?   Example: http://www.linear.com/product/LTC1751
Here is one way to do it.  
Falling off loose or can shove it over loose? Either way will straighten it out. Shoot me a message and I will let you know where to send it.
Depends if the mains transformer primary windings can can be re-wired or not.
Killed it by connecting it to a 9 volt battery without a current limiting resistor. ;)
The lead on the flat side (of the LED) connects to ground. Probe it, got voltage across the leads chances are it's backward.
Yes you can check the current draw by measuring amps across the switch terminals.   And yes again.....Measure the DC offset between the right or left output and ground. (both tests are performed without the headphones plugged in and no music playing)   Also check that the op-amp is not getting hot when the amp is playing music.   http://tangentsoft.net/audio/trouble.html
Try some actual troubleshooting instead of guessing.   . What's the idle current draw? What's the reading when measuring voltage between the op-amp's pin 4 and ground? What's the reading when measuring voltage between the op-amp's pin 8 and ground? What's the reading when measuring between pin 4 and pin 8? What's the power supply voltage? What's the DC offset of the left channel? What's the DC offset of the right channel?   IIRC tangent has a troubleshooting...
Do they have the MCM 21-4590 boards at Farnell?   http://www.newark.com/mcm/21-4590/small-pc-prototype-board-number/dp/38C9100
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