I have a few output transformers with limited information available so I would like to find out how to calculate the maximum current rating in the primary winding so I can determine which tube and circuit design the transformer could be used with.
I have done a bit of research about formulas and such but I don't think I got this right.
For example let's take an output transformer with a 7:1 ratio (30K/600) and a maximum level of +23dBm as specified in the datasheet
23dBm into 600ohm = 10.94V rms
Secondary current = 10.94V / 600ohm = 18.2mA
Primary current = Secondary current / 7 = 2.6mA
If the output transformer primary is center tapped that would mean 1.3mA each primary winding ? It seems very little given the physical size of the transformer.
I suppose knowing the wire gauge of the primary could give an idea of the maximum current rating, but that is obviously impossible to know without taking the transformer apart.
Alternatively, could the current rating be determined using the winding DC resistances and the turns ratio ? I have some transformers with only that information available.
I have done a bit of research about formulas and such but I don't think I got this right.
For example let's take an output transformer with a 7:1 ratio (30K/600) and a maximum level of +23dBm as specified in the datasheet
23dBm into 600ohm = 10.94V rms
Secondary current = 10.94V / 600ohm = 18.2mA
Primary current = Secondary current / 7 = 2.6mA
If the output transformer primary is center tapped that would mean 1.3mA each primary winding ? It seems very little given the physical size of the transformer.
I suppose knowing the wire gauge of the primary could give an idea of the maximum current rating, but that is obviously impossible to know without taking the transformer apart.
Alternatively, could the current rating be determined using the winding DC resistances and the turns ratio ? I have some transformers with only that information available.