The Pass Pub: The High-End Off Topic Thread

OK thank you. please forget about Js & Ks for now as M5129L looks maybe to be the problem, tho I dont really know for sure. The problem is when i play vinyl my left channel is very low and somewhat distorted. How can i test this device in situ? There is one for each channel(L-R). If it has to come out then is it possible to drop another(better?) in its place? The fet is dual in line package but the pcb has provision for both inline and 8 pin dip.
Thank You. Brian.
 
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according to service manual ( vinylengine site) , M52129L is operational amplifier , not JFet

if you doubt that one is malfunctioning , swap positions between channels ; if problem stays in same channel - OP is OK < culprit is elsewhere

if problem moves with suspicious OP , there is culprit

however , I would check all switches in signal route prior to any soldering
 
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