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Thanks for all the kind words! Tomcomm: I didn't realize that you were from Santa Ynez. What a great place that is. I've been there many times.
Re the tube: Yes, it is a 21AXP22 and I believe that it is original. I don't know if it's an "A" version. I'll let you know. There is no evidence that it has been regunned. Below the tube number is an "NBC" printed with the same material as the tube markings. I've suspected that it and this set were owned by NBC management or there was some other direct connection with NBC -but I have no proof of this. The tube checks as excellent on my Sencore CRT tester. I can send you pictures of the tube neck on Monday, when I get back to my office.
As far as putting a comp video input on this, I'm for it. The video source you saw for the color bars was a Newtek "pencil" generator via a modulator. The off the air stuff was from a digital converter box. I'd like to be able to jump the VHF tuner and IFs and get some good signal directly into the 1st video. What are your thoughts?
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