AMP is dead quiet when I pull the amp
Posted: Wed Nov 01, 2017 6:10 am
Hi,
I picked up a NAD 3020A amp. When I turn it on, a loud hum sound comes through the speakers for a second and then fades off. The problem is in the preamp section, as the amp is dead quiet when I pull the amp/preamp jumpers and turn it on. All of the pots have been cleaned. The amp works fine after the hum goes away. Someone suggest me the pre-out muting fets leak. J111 is generic so I looked here https://www.icrfq.com/part/2000795-J111.html for J111 and I got it here. I do not have a schematic for this unit. How many fets should I purchase, and where do they go?
Any suggestion will be appreciated.
I picked up a NAD 3020A amp. When I turn it on, a loud hum sound comes through the speakers for a second and then fades off. The problem is in the preamp section, as the amp is dead quiet when I pull the amp/preamp jumpers and turn it on. All of the pots have been cleaned. The amp works fine after the hum goes away. Someone suggest me the pre-out muting fets leak. J111 is generic so I looked here https://www.icrfq.com/part/2000795-J111.html for J111 and I got it here. I do not have a schematic for this unit. How many fets should I purchase, and where do they go?
Any suggestion will be appreciated.