A rule of thumb says that the screen around an oscillator coils could
be 3 times the coil diameter, and Radiotron Designer's handbook, 3rd
edition, 1941 says that the screen should go at least one coil radius
above the coil. But how far from the chassis should the coil winding
start?

73
Jan-Martin
LA8AK, http://home.online.no/~la8ak/c.htm