> 60 hz ripple, as in transformer and diode, on half the time, or 100kHz
 > switcher ripple, a few 10's of mA on the output current?
"Unfiltered full-rectified AC voltage has a ripple factor of 
approximately 48% which can decrease the performance of the TEC by as 
much as 23%."

Straight from the horse's mouth:
http://www.marlow.com/TechnicalInfo/power_supplies.htm

Regards,
Mohit Mahajan.
David VanHorn wrote:
>>  > Why does ripple matter ?
>> Almost all manufacturers state that peltiers don't like ripples in their
>> supply.
> 
> 60 hz ripple, as in transformer and diode, on half the time, or 100kHz
> switcher ripple, a few 10's of mA on the output current?
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