The choice of specific grid leak values always seemed purest magic to me. But you can't always lay hands on an 829B when you need one. All, All utilities have employees who track down and correct interference. My dad did this for many years before he retired. If there is any intereset I could get hold of him and find out what the exact legal rights of the customer are and what the basic procedure is for getting the best results.
Real radios glow in the dark.
Bob Power is no substitute for skill. If it stayed up last winter, it was too small. 136 Hermitage Rd. As a point of comparison the 813 is useable at full ratings up to 30 MHz, and I've seen 10 meter amps using them.