03-22-2009, 11:32 AM
Hi All- I am restoring a Philco model 366 (U.S. 66) cathedral set, and I am having trouble finding the value for the winding on the filter choke. I have scoured through all the Canadian and U.S. schematics and no drawings or charts list that. Would anyone have a measurment from one?
The problem I am having is that both before and after replacing all the filters, capacitors, and out-of-tolerance resistors, I still have a loud 60 cycle hum all the time. If I disconnect the filter from either side of the choke, and subsitute in a much larger value cap, the hum gets a lot less. If I put in a 150uf cap, the hum disappears altogether. The resistance across the choke seems low- less than 20 ohms. Does this sound like the problem?
:
Brad
The problem I am having is that both before and after replacing all the filters, capacitors, and out-of-tolerance resistors, I still have a loud 60 cycle hum all the time. If I disconnect the filter from either side of the choke, and subsitute in a much larger value cap, the hum gets a lot less. If I put in a 150uf cap, the hum disappears altogether. The resistance across the choke seems low- less than 20 ohms. Does this sound like the problem?
: Brad
