14rp4 substitute

[timmy]

Originally Posted by dieseljeep

Using a 450 ma heater in series with 600ma tubes without a shunt resistor, the 450ma heater would receive too much voltage and the 600ma tubes would be starved. You could consider the 450ma heater as the weak link.
Once in a while, an experiment is in order!
When installing the CRT, try various resistor values between 42 and 56 ohms and check the voltage across the heater. Line voltages vary in some areas.
Get the set working properly first, with the original CRT and then address the CRT issue.

So in the end the 14at will be getting 6.3 v or around 8 v . I get the ma but not the voltage. Just had a thought the B&W tube brightiner they increase voltage to but the ma may be low, any thought on these in this case.