mb9513
Junior Member
Posts: 57 
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Post by mb9513 on Nov 1, 2017 2:52:06 GMT
Hi all: in final stages of going through 100J. it get a loud 60 cycle hum through the amp when the trip coil energizes at the end of a record. when tripped manually no hum. trip to load no hum,(assume because amp is muted). I changed the coil thinking that was shorted, same problem. I get a feeling it is some kind of grounding issue or a bad cap, even though the amp and wsr have been recapped. Thanks in advance. Mark
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Post by robnyc on Nov 1, 2017 10:11:46 GMT
"MB" check that the shields of both the pickup and mute cable are floating with respect to the mechanism. That is they show no continuity to the mech -only their respective ground points at the amp.
RobNYC
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Post by Ron Rich on Nov 1, 2017 14:12:11 GMT
Hi Mark,
If not a problem in the shields-- What is the resistance reading of the trip/detent coil ? What amp is installed in that phono ? Where is the "hum-pot" grounded ? Is the cap (.01--I think ?) installed across the reject plug in the WSR ? Check the mechanism plug ground all the way to the mech screw--izit tight ? Ron Rich
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mb9513
Junior Member
Posts: 57
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Post by mb9513 on Nov 27, 2017 4:32:14 GMT
So sorry I did not let you all know I found the problem. it was a broken wire at the mute plug. thanks again! Mark
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Post by Ron Rich on Nov 27, 2017 14:15:40 GMT
Hi Mark,
Thanks for the update--question--which pin was open ? Ron Rich
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