This radio had an open speaker field coil. I subbed a choke from my junk pi le in place of the coil and used a PM magnet speaker. I have no idea what t he specs on the OEM field coil were or those of the choke for that matter. I just grabbed something to try. The choke is about half the size of a base ball if that makes any sense. The choke came out of something God only know s what and how long ago and measures about 40 ohms. The filter, a three sec tion twenty UF, two at 450V and one at 25 volts was replaced at some point and seems to be OK. I mention this because there is a very slight hum out o f the speaker and I'm thinking that perhaps the elimination of the hum buck ing coil in the OEM speaker is the cause of this. The hum isn't that bad. a s soon as you turn the volume up a bit it's really not noticeable but witho ut using another electro dynamic speaker can I do anything about this? I'm also wondering if I sized the choke properly. Does anyone have any thoughts on these two concerns? Thanks, Lenny
- posted
5 years ago