Deek wrote:

What, pray tell, is a modulation 'Reactor'?

I know what a modulation transformer is.

I know what screen grid modulation is.

I know what Heising modulation is.

snip
Hi,

A modulation reactor is a big, HV insulated audio choke used to feed
d.c. to the tube finals of a broadcast a.m. transmitter.
The modulation transformer itself is capacitively coupled
across the modulation reactor. This keeps
d.c. off the modulation transformer secondary windings,
to reduce risk of saturation.

73,
Ed Knobloch