[Ed_Dinning]

Hi gents, a further thought on checking regulation.
Connect a power resistor across the anode supply to draw say 40mA. Note voltage regulation.
Connect a resistor to draw the same current across the diode bridge and note regulation, then repeat this across the transformer winding, noting regulation figures. The regulation across the anode supply should be better (less volts) than the other two if the reg is working correctly, provided the voltage does not drop too far at the rectifier/winding, this is a test for headroom.
You could also repeat at a current of about 50mA for a period of a minute of so and look for droop. This could be due to a poor soldered joint. Switch off, discharge all caps and check joints for temp.

Ed