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RE: shunt regulation for upgraded paramour I ???

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Thanks for the info....very much appreciated. I am going to have to study the circuit a little as this is a bit over my head.

I read PJ's posts about converting to the 45, but since I have upgraded the iron and the C4S, I am still not sure what to do. I know that the 270ohm power supply resistor was cut out for the upgrade with the new choke.

Do I just need to replace the the cathode resistor with a 10 watt 1600 ohm resistor to ge the appropriate values for the 45 tube or is there a mod I need to do to get the power supply prepared for the 45's? Or do I need to modify the values of the resistor on the C4S board also?????

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