Well finally got to the bottom of this and it was nothing to do with the power supply ...
... I failed to check the data sheet for the transistors carefully enough and stuck them all in backwards - once again proving, if proof were needed, that I'm a bit of a moron.
Dave.
... I failed to check the data sheet for the transistors carefully enough and stuck them all in backwards - once again proving, if proof were needed, that I'm a bit of a moron.
Dave.