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RE: What tubes to use with this Interstage Transformers?

The problem with the (FG Z + external series resistor = new FG Z) when the load circuit has reactive component and it will change depends on the AC source. The results aren't the same everytime a signal from the FG increases or the frequency increases or decrease.

this is case with any source with a greater than 0 output impedance. For this particular application it is the fact that the source Z is 5K that we are using to our advantage in order to find the effect of the reactive component (primary L). The variation you speak of is exactly what we are looking for so we can work it against the other knowns to find the unknown (primary L)

dave




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