07-18-2015, 05:35 PM
Welcome to the Phorum!!!! 
As Mike and Terry said, that cap that was tacked in under the chassis was probably an old repair to replace the original electrolytic cap that had died. The old cap is probably an aluminum can that sits above the chassis with the lug below. You can take off the replacement cap and stuff new electrolytic cap into the can. There are a number of threads showing how to do that but here's one to start that gives you and idea of what to do. You will need to replace all electrolytic and paper caps. mica caps are likely still good. Also check and replace resistors that have drifted high (>20%). Some folks replace all resistors any way. 1940 sets may have rubber coated wires that need replacing as well. See this thread.
As Mike and Terry said, that cap that was tacked in under the chassis was probably an old repair to replace the original electrolytic cap that had died. The old cap is probably an aluminum can that sits above the chassis with the lug below. You can take off the replacement cap and stuff new electrolytic cap into the can. There are a number of threads showing how to do that but here's one to start that gives you and idea of what to do. You will need to replace all electrolytic and paper caps. mica caps are likely still good. Also check and replace resistors that have drifted high (>20%). Some folks replace all resistors any way. 1940 sets may have rubber coated wires that need replacing as well. See this thread.
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