Picture Tube Swap

[jpdylon]

yes the GP4 uses only the single field ion trap, so you'll need to find a dual field. I would also consider buying some thin foam tape to put along the inside of the strap so it will not bite into the tube when you strap it in. i would also hold the tube in place on the chassis to make sure the CRT will clear chassis parts. You wouldn't want it to hit anything like a filter or tube.

good luck!