Quote:
Originally Posted by Argus25
In the case of the circuit provided by the OP, it could be regarded as a circuit that converts the modulated RF into a plate current.
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The output impedance of this circuit is probably lower than an IFT, so it would look more like a voltage source than an IFT. I think it works by providing a little non-AGCed voltage gain, and allowing the final IFT to work into a highish impedance.