I would like to adjust the tube heater voltage without using the tube. The tube rating is 5V/2A. I believe I can use a resistor in its place with the same effect, but I have never tried. Can someone confirm what should be the resistor's resistance and power rating? And if this is a good method?
Thanks!
Thanks!
Yes, this is a good technique. Use ohms law to calculate the required resistance and power..
At least double the rated power of the resistor based on calculation.
R = E/I where E is the operating voltage and I is the desired current.
P = I x E
At least double the rated power of the resistor based on calculation.
R = E/I where E is the operating voltage and I is the desired current.
P = I x E
Hi,
Thanks for the fast reply.
So for the 5V/2A tube it would be a 2.5ohm resistor rated at 20W, that's it?
Thanks for the fast reply.
So for the 5V/2A tube it would be a 2.5ohm resistor rated at 20W, that's it?
Yes, OK, but use a higher wattage resistor, because it may run hot. Also, if the 5V is from a rectifier, be aware with the high voltages at their anodes.
Good luck.
Good luck.
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