I have been playing with a couple of HV smps's I have purchased from 
alibaba with an audio circuit and have found a problem I was wondering if 
anyone had any suggestions for fixing.  Essentially they get very unhappy 
if one plugs in an rca line level input while the amp is turned on.  Here 
is an example of one of them. 

http://www.aliexpress.com/snapshot/6849909268.html?orderId=68754413558174

The unit doesn't die outright and still puts out the HV it was set to but 
it gets very noisy. You can see the power led flicker consistently, as soon 
as you put a load on it. 

Any thoughts on this are appreciated. 

Bob

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