[Boatanchors] CATHODE MODULATOR - ARRL 1954 6SL7 6Y6

[Greg Mijal]

Hi:
I built the Cathode Modulator listed in the TIS pages at the ARRL website as the Simple Modulator.
It's from a 1954 article and uses a 6Y6 and a fixed inductor in the output.
I'm wondering what value of inductor is needed to modulate a 75 W input rig.  The article does not list a value only "small ac/dc inductor" but it seems to be an open frame type.
I built one of these as a kid and it worked with my DX 20.
Can't remember what I used way back when.
Thanks
Greg
WA7LYO
in sunny Feenix