[BC] Comparing the audio in the Big 50's

[Art Reed]

Robert Meuser wrote:

>For older stations this should not be a big problem since the older transmitters required so much more power so there would already a lot of power available. Remember a few stations had their own substations taking only an HV feed from the utility.

This comment dovetails with something I saw recently. I had occasion about a month ago to be at the KDKA transmitter site, to witness installation of one of the FEMA "doomsday" transmitter buildings. But, my other interest was to have the opportunity to examine the remains of the Westinghouse HG-50 transmitter that is still on-site.
The one thing I saw that I didn't fully understand was a device marked "induction regulator", a motorized coil arrangement that I believe was used to balance voltage, current, and/or phase between the three phases of 480v driving the transmitter. I don't quite understand what its function was, or what modern-day technology takes its place. I noticed that its operation was sufficiently important to be included on the transmitter's operating "podium", where you could select Manual or Automatic operation of the regulator. Anyone care to explain this device to me?

Art Reed