30-11-2013, 10:13 PM
Obtaining those replacement capacitors should be no problem, note they are all polarized electrolytic and the correct polarity should be observed when replacing them, the 500uf, 8uf, and 4uf are older style values, if you can't get them you can use the nearest value such as 470uf, 10uf and 4.7uf respectively as the production tolerance for the capacity of electrolytics is quite wide.
100uf are still a common production value, the voltage ratings need to be at least the same as the originals or higher, 25v dc working would be ok.
If you should happen to buy on Ebay then be wary of some of the Far East offerings, some of their capacitors are known to have been sub standard.
If you replace them try replacing one at a time and see what improvement there is to the receiver, it will help you to gain an insight as to how they relate to the circuits function. At that age they need replacing anyway as a matter of course for the future reliabilty of the receiver. If C10 (4uf) has lost its capacitance you will have low gain for sure.
Good luck.
Lawrence.
100uf are still a common production value, the voltage ratings need to be at least the same as the originals or higher, 25v dc working would be ok.
If you should happen to buy on Ebay then be wary of some of the Far East offerings, some of their capacitors are known to have been sub standard.
If you replace them try replacing one at a time and see what improvement there is to the receiver, it will help you to gain an insight as to how they relate to the circuits function. At that age they need replacing anyway as a matter of course for the future reliabilty of the receiver. If C10 (4uf) has lost its capacitance you will have low gain for sure.
Good luck.
Lawrence.
