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For TV, I try to stick with GE, RCA or Sylvania. I know many of the manufacturer branded tubes (Magnavox,Zenith, etc) were made by one of the three. I have several SHARP branded tubes in my junk box. I don't know who made them and only use them as a last resort (most of the Sharps in the box are series string).
I have not noticed any difference in color saturation or anything else TV related when I switched tube brands. If the tube tests good, it stays there, regardless of branding. If it fails in circuit, then I swap it. I have had some tubes fail in one set, but work fine in another, so I don't toss any tube unless it's obviously bad, or has enough H-K leakage to make it questionable.
I know I might get dinged for this, but I have GE, RCA and maybe a Philco tube living in my HH Scott amp. It works fine and I'll eventually recap it. I've not had trouble with microphonics or anything else weird. In fact, I've only replaced two tubes in the years I had the Scott (5AR4 and 12AX7).
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