left channel gone

Hi, last year I started restoring the old SA-8100 which belonged to my mother. I changed all the e-caps (including the ltwo large ones 10 mF 50V, half of the diodes, half of the transistors and the relay. The unit works quite well and the improvement has been noticeable, but there are still some...

I recently started a rebuild of my Marantz 2220B. While i have experience working with & soldering circuit board, this is my first rebuild on an old receiver. The only problem I have seems to be a tough one...no one else can figure it out or even give me any useful ideas what it could be. The...

Hi, I have a NAD 3155 that has worked very well over the years. Now though the left channel has stopped working and I thought I'd give it a shot at diagnosing it. I have opened it and cleaned it with air and electronics spray and it helped with crackeling in the audio knob, but still just...

Recently picked up a KA-770D for $20 on my local Craigslist. I hooked it up and found the left channel (both A and B speaker settings) is virtually silent. (If I listen closely, I can hear it very softly). The sound out of the right channel sounds normal/good. Here's what I've ruled out so far...

My 2020 has been working fine, no issues as a bedroom receiver. (Light use). Background info: All service bulletins were completed, as well as other repair work to bring this unit back to life, about a year ago. (With help from multiple contributors on AK!) During recent use, I heard a couple...