I have a beautiful CR-620 that HAD bad outputs. I replaced all 4 outputs with MJ21193/94 and recapped the power supply section. I used a dim bulb and powered it on. The unit was repaired and worked well for a few weeks... After running it for a few weeks, the main AC fuse (3.0A 250V) blew. Hoping it was a fluke or a surge, I replaced the fuse and brought it up on the DBT and the bulb was glowing full force. After some troubleshooting, I found that if I removed both outputs for the RIGHT channel, the unit powers on, and I get a relay click. However both of the output transistors for the right channel test fine, and I even swapped them out with a different working pair, but the unit will still glow the bulb when the right channel outputs are installed. Any ideas of even where to begin to start would be greatly appreciated!!