[R-390] L601/L602

quartz55 quartz55 at hughes.net
Fri Dec 20 13:32:04 EST 2013


I replaced them in one of my AF/PS modules thinking they are bad.  The PS circuit sure works good now, all the voltages are right on, where before the voltages were real high with lots of ripple, like 20VP-P ripple.  They measure 65/82 ohms.  L603 was definitely bad, it was swollen up and burned on the outside.  But I'm wondering if L603 may have been the whole culprit?  I really don't want to pull out the ones I put in, is there any easy way to test the chokes?  I tried with my Heathkit LCR meter, but they measure in the mH range at 1000Hz.  I understand they need to be measured at their rated current, but how does one really do that?  I also understand the resistance as marked (137) is a max and may be lots lower than that.


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