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Hey everyone, I’m not finding a lot of info about this model of amp. I recently picked up this rad stack from a local ad, and I didn’t get a lot of info other than it was a custom built piece by a Phase Linear employee. Was there a production 400B? I’m anxious to fire it up and see what it’s...

Hi everyone, Sounds like this is the place to be! (lame pun) I am hoping to learn from and humbly participate with this extremely knowledgeable group. I am very new to vintage audio equipment and have a lot of questions! I recently acquired the following family heirlooms: Phase Linear 700b...