A Bad Digital System 3

[jstout66]

A fellow AKer told me about a Digital System 3 that was in a thrift store in my area.
I just wanted to vent about those short lived "bad" Zenith picture tubes of that era.
I went to go look at it, and figures.... a high end model with "Sound By Bose", a cabinet style I loved, the set was clean, and at a fantastic price.
Go figure it had the worse picture of all the sets there. It wasn't the worse I've seen of those bad tube Zeniths, BUT had bad convergence and a horrid pix on Black & White.
Too bad it had that crappy tube in it. I'm not familiar with the digital line. How were the chassis, and were there better replacement tubes for them?