Likely not very helpful, but I had a few Dyna 400s in my day, with and without meters. I found them to be ok sounding, but that was with analog only sources, different rooms and so on. I cannot speak for today if I would enjoy listening to one. I have a very large amp collection, and I enjoy many of them, as my speakers are very easy to drive. My best, MrD.
Is my Dynaco Stereo 400 worth repairing for resale?
After all the years, I’m sure it needs a good cleaning and at least all the cans replaced.
Will I even break even?
https://drive.google.com/file/d/10BBbN8Vd2_2sgQAoMI8N5CqnWdhASrbH/view?usp=drivesdk