> What was the ripple requirement/EMI compatibility
> on this?

Ripple was "less the better, tell us what you achieve" :-)
See below for closest part of original spec.

A circuit of your valve supply driver and comments would be of interest.
(There are lots of paper designs for this sort of things but real circuits
and people's experiences are invaluable).



        Russell

_________________________________________

Output regulation
    Smaller change the better
    Ideally +/- 0.1 volts across all Vin range and across
    load variation from 10% to 100%

Noise / EMC
    Output noise should be "reasonable" but post filtering for noise may be
necessary and is not included in the costing. A design that does not need
any post filtering is better. Extra filtering should NOT be required to meet
regulation specification. EMC / radiated or conducted noise should be
amenable to limiting by normal means.

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