Re: ECF82 frequency changer
Note that in the circuit Andy's posted, the coupling is scaled down by thecoupling winding on the oscillator coil and that the coupling is applied to an undecoupled cathode resistor in the pentode.
In the first circuit everywhere stray coupling could have gone to was shunted to low impedance with either an off-tune tuned circuit or else a decoupler.
David
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Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done
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