Rebuilding the 15gp22: A final report

[old_tv_nut]

Originally Posted by rca2000

I am not sure I understand all of this.

Not only did these tubes have different glass than later ones, they had an internal phosphor plate, so there was definitely a conflict between the temperature schedule for sealing and evacuation and protecting the plate from thermal damage. You also need to consider that the qualities of the glass change each time it is heated and cooled, so a schedule that works for original manufacture may not work for rebuild. I'm sure there are many other expert knowledge items that I don't know about, which disappeared when the last 15GP22 line was shut down.