12-31-2014, 12:03 PM
Ted
Basic ohms law comes into play here. looks like The candohm #83 is the one you are talking about
I just did the same thing on a 38-10 I have been working on.
It's being use to create the negative bias voltages and it's carrying all the current of the power supply.
This radio has a lot going on so it's going to use a lot of current with push pull output and driver tubes.
The book states that typical current for that rectifier tube is 250MA.
So the small resistor sections 22 and 18 ohm I would use 2 watt resistors and the 146ohm section I used a 20 watter. There going to get hot.
Once you get it up and running be sure to measure the voltage drops and figure the power being dissipated in each.
I was told to always double the size of the resistor for the wattage calculated.
I should defer here to the more experienced wizards of the phorum.
Good luck
Basic ohms law comes into play here. looks like The candohm #83 is the one you are talking about
I just did the same thing on a 38-10 I have been working on.
It's being use to create the negative bias voltages and it's carrying all the current of the power supply.
This radio has a lot going on so it's going to use a lot of current with push pull output and driver tubes.
The book states that typical current for that rectifier tube is 250MA.
So the small resistor sections 22 and 18 ohm I would use 2 watt resistors and the 146ohm section I used a 20 watter. There going to get hot.
Once you get it up and running be sure to measure the voltage drops and figure the power being dissipated in each.
I was told to always double the size of the resistor for the wattage calculated.
I should defer here to the more experienced wizards of the phorum.
Good luck
!!!!!!!!!!!!!!!!!!!RESISTANCE IS FUTILE!!!!!!!!!!!!!!!!!!!!!!
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[Image: http://philcoradio.com/phorum/images/smi...on_eek.gif] Chris
