UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Different capacitors in the chassis and different values in the schematic !

Uncle Bulgaria · 7th Nov 2019, 1:35 pm

It is likely that some of the resistors have become unstable after such a long time. In the amplifier, I expect some are used in RC filters. If you've got used to the sound before you changed the capacitors, and the resistors are unchanged, it is a possibility that the frequency filters made from resistors and capacitors have now changed value. The result would be as if a tone control were continually in operation. I think it would be worth measuring some of the likely components, as changing old parts for new can remove the mask that concealed other problems!

7th Nov 2019, 1:35 pm	#16
Uncle Bulgaria Nonode Join Date: May 2016 Location: Cornwall, UK. Posts: 2,335	Re: Different capacitors in the chassis and different values in the schematic ! It is likely that some of the resistors have become unstable after such a long time. In the amplifier, I expect some are used in RC filters. If you've got used to the sound before you changed the capacitors, and the resistors are unchanged, it is a possibility that the frequency filters made from resistors and capacitors have now changed value. The result would be as if a tone control were continually in operation. I think it would be worth measuring some of the likely components, as changing old parts for new can remove the mask that concealed other problems!