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[Amps] Heising Choke

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Subject: [Amps] Heising Choke
From: (Vic Rosenthal)
Date: Tue, 17 Sep 2002 17:06:01 -0700
> The Heising choke is perfect for using a parallel 815m driven by a 2A3, to
> AM modulate an HY-69.  You can get up to 80% modulation as is.  By placing
> a resistor (and bypass capacitor) in series with the HY-69, you can reach
> 100% modulation.
> Be sure to remember to install a fresh bias cell before firing up.

Why would you want to use a UHF tetrode like the 815 as a modulator?  You could
use it for a 112 Mc final.  A pair of modern 6L6's could easily make enough suds
for high-level plate modulation of an HY69.

And it's a condenser, not a capacitor.


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