zenith color roundie tv saved from barn 6/3/12

[Charlie]

Originally Posted by snelson903

yeah it looks like its orginal, dam i was really hoping for a rebuild one.

Why? A rebuilt tube does not necessarily mean it will be a good tube. I used to get excited if I found a tube had been already replaced (rebuild or not) and then end up disappointed that the replacement was no good.

Two years ago, I brought home an 63 Zenith and a 66 CM in the same day. I saw the CRT in the Zenith had been replaced... i think with a late-70's Sylvania tube... it was dead. The Curtis Mathes (which has the instant on feature) had the original tube and tested just fine.

Side note- I've brought home Sylvania round tubes on 3 different occasions... all had 1970's date codes... and they were all no good.

I think the big advantage on CRTs that have been replaced is the situation where the replacement was a better tube (regarding design) than the original. For instance, the 21CYP22 in my CTC9 was replaced with a 21FBP22. The FBP should have better brightness and reds than the CYP.