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I've got three myself two J's and I think B Only two good 7JP4's The transformer setup is to isolate the 7JP4 heater from heater string and ballast tube. If it burned out and shorted it could take out the crt.The other tubes are pretty common so I don't know if it's worth the work to rewire. As for the resistance I think it's mentioned in the Motorola service manual. It's used to operate/troubleshoot the chaiss without the crt. I'll take a look. I found a mod to fix vertical retrace. I'll post it later. I'll mention be very careful with your 7JP4. The defection plates have a nasty habbit of getting loose. I noticed on my set the picture moves a bit when I turn it up on it's side.
Gosh all we need now the mask!!!!
Terry
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