[AMRadio] Modulation of the screen grid

[Donald Chester]

Since the screen modulatiot impedance is at much higher impedance than the 
plate modulation impedance, you can get by with much lower coupling 
capacitance that keeps DC off the screen modulation transformer than 4 uf.  
0.5 or 1 uf should be enough.

I once tried a similar circuit to modualte the rf driver stage along with 
the final.

Don K4KYV

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