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I took a look in the manual for the resistor to subtitute in place of the 7JP4 heater. When serviceing the chaiss they just jumper across pin 1 & 12 (heater). If you want to service without HV they use a 75ohm 10w resister across the 25L6 HV osc heater or remove pins 3 and 4 ( plate and screen) from a spare 25L6.I think I was thinking of the 25L6 instead of the 7JP4.
Terry
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