02-07-2012, 10:19 AM
Very well. The first thing you should do is not plug in the radio until several steps are taken. The first thing is to replace the electrolytic capacitors which are the large value polarized ones in the power supply. In a radio this old, they are certainly unreliable/dangerous, and are part of why you get ony a hum. You should post your schematic here so we can refer to it.
After that you will want to replace all the paper capacitors (those gummy wax covered beasts,) with modern ones. These you don't measure, you just replace. You will also measure the resistors and those found more than 20% out of tolerence must be replaced. I usually replace all the small carbon resistors because it is easy and cheap to do so.
Once you are certain your schematic is the correct one for your set, you can use it to create a parts list for your order. Best buy everything at once to avoid delay and another shipping charge.
A great source for parts (happens to be in Canada) is http://www.justradios.com/
if you don't have one, get an inexpensive digital meter that reads volts and ohms, etc... They're available for less than $20.
After that you will want to replace all the paper capacitors (those gummy wax covered beasts,) with modern ones. These you don't measure, you just replace. You will also measure the resistors and those found more than 20% out of tolerence must be replaced. I usually replace all the small carbon resistors because it is easy and cheap to do so.
Once you are certain your schematic is the correct one for your set, you can use it to create a parts list for your order. Best buy everything at once to avoid delay and another shipping charge.
A great source for parts (happens to be in Canada) is http://www.justradios.com/
if you don't have one, get an inexpensive digital meter that reads volts and ohms, etc... They're available for less than $20.
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