On 2008-04-22, EADGBE wrote:

I have just discovered that the voltage measured directly at the
emitter leg of Q208 is a NEGATIVE voltage that fluctuates anywhere
from -300mV to -16mV.

By subtraction from the 7.3 V you said was present at the junction of the
two 3.3 ohm resistors there's nominally 7.3 to 7.6 V across the lower one.

So it looks like:

- that lower 3.3 ohm resistor is open circuit; or

- it's dissipating about 16 watts because of another fault and presumably
getting rather hot which may lead to it going o/c soon (depending
on its power rating which I would guess doesn't support a 16 watt
dissipation); or

- it isn't actually connected to the emitter of Q208 so check the
soldering.

--
John Phillips