David Looser wrote:
"Ian Bell" wrote in message
...
Pretty much but I was trying to avoid having a bleed resistor permanently
across the supply. The PSU has a lot of stored charge and a bleed resistor
that takes only a nominal 1% of the load current would take about 5
minutes to discharge it. That in itself is not a problem as the PSU is in
an enclosure but when I am testing it, it is a pain to have to wait that
long.


If you switch off the supply to the HT rectifier before the heaters go off
then the load current itself will discharge the smoothing capacitors.



Normally that would be the case but this power supply has a lot more
capacitive smoothing than the average and there is still significant
stored charge once the heaters have cooled.

Cheers

Ian

David.