03-29-2014, 04:42 PM
My latest toy, a 37-650, worked great when I got it and now about 3/4 done with the resistors and caps and still plays great. Tag shows it was rebuilt in 1963, looks like a number of caps were replaced and a little wiring.
The problem is that I have a difference between the actual radio and the schematic at the volume pot. Looking at the schematic, part #40, a 75pf cap, is missing. What I have is resistor #41, 40k resistor is tied to cap #43 and the top of the pot, not to the center tap. Center tap is tied to cap #33. I did install a 75pf cap between top and center taps, but I cannot say it made any difference. The tone sounds great except the first setting almost sound like a pocket radio... normal for this setting??? The volume pot looks to be original, it is a 3 tap 2Meg.
Also in my output section, I have a resistor not on the diagram and looks like it was from the factory, it is between the junctions of parts #45, 46 and parts #47 and 53. I think it is a 330k ohm, any ideas why this is here? I left it in as the radio plays fine.
Thanks, Don
http://www.theoldradiofixerupperguy.com/...37-650.pdf
The problem is that I have a difference between the actual radio and the schematic at the volume pot. Looking at the schematic, part #40, a 75pf cap, is missing. What I have is resistor #41, 40k resistor is tied to cap #43 and the top of the pot, not to the center tap. Center tap is tied to cap #33. I did install a 75pf cap between top and center taps, but I cannot say it made any difference. The tone sounds great except the first setting almost sound like a pocket radio... normal for this setting??? The volume pot looks to be original, it is a 3 tap 2Meg.
Also in my output section, I have a resistor not on the diagram and looks like it was from the factory, it is between the junctions of parts #45, 46 and parts #47 and 53. I think it is a 330k ohm, any ideas why this is here? I left it in as the radio plays fine.
Thanks, Don
http://www.theoldradiofixerupperguy.com/...37-650.pdf
