[Steve D.]

Phil's comprehensive article on converting glass to metal CRT's is probably the way to go. Just for reference I thought I'd post a photo of my CTC-5 Wingate with the RCA metal to glass CRT conversion kit. When I purchased the Wingate many years ago it already had the conversion kit installed. The previous owner had converted the original 21AX to a 21GUP22. I personally have never seen one of these RCA factory conversion kits offered on Ebay or any other source. The kit has a large diameter metal ring with welded attachments at 11-1 o'clock & 5-7 o'clock positions that screw into the existing CTC-5 mask to hold the tube in place as seen in the photos.

-Steve D.