need help on where to start looking:
I have a SA-7500 in good condition. I have recapped the Phono board with the help of markthefixer awhile back. That came out fine. When powered on, the relay clicks in after 2 sec. Recently, after about 10 min of playing, one channel makes a lot of static noise, the protection relay clicks in and sometimes several times in a roll. When first turned on, DC offset is less than 5mv each side. When the noise starts, the one channel starts climbing to 5-600 mv. I swapped the preamp out , and the high DC remains with the amp. I’m a noob with troubleshooting, so what’s next? Thanks.
I have a SA-7500 in good condition. I have recapped the Phono board with the help of markthefixer awhile back. That came out fine. When powered on, the relay clicks in after 2 sec. Recently, after about 10 min of playing, one channel makes a lot of static noise, the protection relay clicks in and sometimes several times in a roll. When first turned on, DC offset is less than 5mv each side. When the noise starts, the one channel starts climbing to 5-600 mv. I swapped the preamp out , and the high DC remains with the amp. I’m a noob with troubleshooting, so what’s next? Thanks.