03-05-2018, 12:52 PM
Thanks Russ. I will experiment with making a new cone as I am not at all satisfied with the original. The original had been sprayed with some sort of coating, so I didn't think another layer of lacquer would hurt. But the edges where the leather was attached is so fragile and distorted that i was surprised to even be able to get where I did! As i said, it sounds great. But, a new cone is in order. Once finished, I may go back to rivets around the perimeter as in the original.
I'm not looking forward to working with the pot metal. In my player piano days, I did a lot of work with that stuff. Fabricating a few new parts as you did should not be a problem. Just work! I also need to try and find the tubes for this radio. would like to try and find the original #'s.
By the way, do you have any idea of the value of the grid leak resistors that are in the glass tubes mounted on the tuning caps? I find no indication in the schematics. No indication of the filter capacitor sizes either though I was able to measure most of them and they are fairly consistant. if my readings are remotely close to real capacity, this thing was fairly well filtered. I'm looking at 10 mfd before the choke, 20 after and another 6 after a series resistor. The bias supplies vary from 2 to 8.
I'm not looking forward to working with the pot metal. In my player piano days, I did a lot of work with that stuff. Fabricating a few new parts as you did should not be a problem. Just work! I also need to try and find the tubes for this radio. would like to try and find the original #'s.
By the way, do you have any idea of the value of the grid leak resistors that are in the glass tubes mounted on the tuning caps? I find no indication in the schematics. No indication of the filter capacitor sizes either though I was able to measure most of them and they are fairly consistant. if my readings are remotely close to real capacity, this thing was fairly well filtered. I'm looking at 10 mfd before the choke, 20 after and another 6 after a series resistor. The bias supplies vary from 2 to 8.