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IC are good. Also vishay and ICEL and Solen.

Ground screws around input section can be tightened

Is it on both channels?

Check phono stage power supply rails and if they test good then break out the scope and start signal tracing. Lots of corrosive glue on this model unfortunately.

Use an oscilloscope to find out where the signal drops out

How many watts did you listen at? My M70 only pushes out 30 at most at the volumes I listen at

1213 transistors need to go. Also 2sc458 bias transistors

It's a cheap amp and probably not really meant to be fixed. Buy a new version is my recommendation

Do NOT replace any transistors unless you are certain they are bad or poorly made. The 2200 is a great home stereo amp, just has a slight bit of ground loop hum that showed up in tests with an oscillator with grounds common to both channels. I have recapped 4 of them. Should be easy to go on...

30mA through the outputs is a good guess for proper idle current

Check DC offset and adjust as needed

Buy something nicer or a better condition same model. I don't have any advice beyond that. These are really cheap amps.

But make sure if that's the issue by emailing Schiit

Poor soldering is my guess. If you could resolder each joint go for it.

You'll probly get 125WPC. Should sound better. Do not use with speakers below 6Ω

in what ways did the m80 sound better? better bass?

Amprepairman Evan

I started a Columbus Audio Society. We have meetups every Friday. Comment if you want to join

in what ways are the b6 and m85 better than the m70?

I run two audio technician groups on Facebook. One for casual posting and one for technical discussion. To be added, comment your Facebook usernames and post a pic of your workbenches. Each group has 100 very talented members

what sounded better and what strengths and weaknesses did the m70 have?

how was the m80 better? did it have better bass?

Has anyone here done a comparison of the Yamaha M70 to other power amps?

how would you compare m85 to yamaha m70?

Protection circuit timing capacitor. Identify then take it out and check for capacity, if it is not within tolerance replace. If you see a cap with the same value and voltage in the unit then you can swap the two and see if the issue persists