E.F. Johnson Low Pass Filter
I’ve got an E.F. Johnson low-pass filter between my amp and my SM-220. There doesn’t seem to be a model number on it, but it looks a lot like a 250⁄20. The main concern is harmonics the amp may generate.
The adventures of W8BSD
I’ve got an E.F. Johnson low-pass filter between my amp and my SM-220. There doesn’t seem to be a model number on it, but it looks a lot like a 250⁄20. The main concern is harmonics the amp may generate.