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Just wanted to post an update. I replaced my chip 4 years ago and the Modi worked perfectly until recently. It broke again in the exact same way. The usual hair drier method revives it temporarily again. My conclusion is that there is something wrong with the circuit design. Replacing the chip...

Correct. This is the company link. They don't list it anymore of course. https://www.radialeng.com/pro-audio.

Great perspective! For all our talk about how great modern amps and speakers are today I have no doubt that when we look back in 50 years we will laugh that we ever called this HiFi. Enjoy the ride!

I enjoyed reading this technical discussion of their design choices for driver circuitry. Shows they put a lot of thought and expertise into it and certainly answers the question regarding use of 12au7. Thank for sharing!

I bought one of these amps when they were clearing then out new for 1500 and I love it. Probably the best sounding amp I have ever listened too. I do use the built in HPF option and have the bass handled by a sub and that really frees up the Dynaco to do what it does best. I'm not surprised it...

I wonder if the issue was with the quality of the CM6631A chip supplier or the Modi circuit itself. So far mine is still working perfectly since I replaced the chip. So it could have been a bad run of ICs or possibly the Modi circuit stresses the chip beyond normal limits somehow? In any event...

UPDATE: Fixed Permanently! I had the same issue, and applying heat to the chip identified a few pages back (CM6631 Audio processor) always made the DAC recognizable to my PC for a while until it cooled down. Well, I replaced the chip and now my Modi works perfectly! The part was only 5.75 and...

Just joined to say that the heat fix worked for me to. I heated the USB chip mentioned a couple pages back over a light bulb for about 30 seconds and then plugged in the USB cable and it was immediately recognized by the computer. After about another 30 seconds it was too cooled off to get...