UPDATE: I used vga connector from my swep1 that has a wg crt. Good news is the my crt on the rfm works with the amp bypassed and swep1 vga cable.

But before going ahead making a new cable and maybe doing away with the amp, I did notice I forgot to put an rf filter on my vga cable with amp mod connected. Could this cause the problem I have been getting? Ie. No signal in error and trashy picture???

I'll wait for any responses before proceeding any further.

I'm glad the crt is ok as its been sitting in storage for yonks and so out of warranty