From Doug Virden:
"Let's not forget the reason I was able to visit the KAAY transmitter building, the reason being was to pick up a remnant from the old RCA transmitter for Bud. I ended up taking a meter and some tubes which I sent Bud a few weeks ago. I got to take me home a meter and some tubes too. I will let Bud do the honors of posting what he received, here are pics of mine."
Thank you, Doug! I believe the Per Cent meter referenced modulation; The tubes are part of an RF deck, and are 813 power tubes mounted in hefty ceramic bases. Here is a vintage advertisement:
A great many Amateur Radio operators used these in home-built amplifiers for 160 meters (the Ham band just above the AM broadcast band, 1800 to 2000 kHz) and ran them for about 1,000 watts, reliably, for years. They are tough tubes, able to take lots of abuse.
I will have to look around, I think I had a schematic for the old RCA transmitter somewhere, by the time I post my tubes and 12.5 kilovolt meter Doug sent me, I hope to have data on where they were in the RF chain.
Thanks again, Doug!
Bud S. (staceys4@Hotmail.com)