Vintageaudiorevival

Thank you everyone! Going to just do it all. Just ordered all the parts. Anything worth doing is worth overdoing. I only Paid $100 for the stack, so throwing another $300 into it is a no brainer! Thank you again!

Hello everybody. I found an M–1.0t a at Goodwill a few years ago. Long before I had the confidence to work on it myself. It did not work so I sold it not working. Always wondering what I was missing out on. Well, last week I came across another one with a C1 preamp and tuner. It of course also didn’t work, but this time I am determined to fix it. So after some troubleshooting, I found that the PreDrivers were shorted on both channels preventing it from powering on all the way. I have since replaced those, it powered up all voltages were good. I set the Bias and have been listening all day. It sounds great and I’m glad I was able to find another one. However, I have a very loud pop in the speakers about 5 seconds after I switch off the amplifier. It seems that the longer it is powered on the louder the “pop” I have read the service bulletin about the the “turn on / turn off thump” and I’ve ordered the parts to complete the repair however, my question is, is THAT noise THE thump? I have heard amplifiers thump before, but this was a very loud pop. I wouldn’t describe it as a low. I have a hard time believing this “thump fix“ is going to take care of this. Also. this is a Non-inverting model Any insight would be greatly appreciated. Thank you so much.