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Vintage Asylum Classic gear from yesteryear; vintage audio standing the test of time. |
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Vintage Asylum Classic gear from yesteryear; vintage audio standing the test of time. |
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In Reply to: Is my old can cap O.K.? posted by Po on December 26, 2003 at 03:20:59:
Yu-PO,If the value(microfarads)of a cap has dropped,reforming will not save it.REforming affects a cap's leakage current at working voltage only.In addition to the caps in your amp having dropped in value,they were clearly *leaking* excessively to have dragged the B+ voltage down so much.You did the right thing by replacing those sections.I just received a 500C that had 3 can caps completely dead. Dead, unreformable caps will become the norm pretty soon especially where high surge voltages are found in poweramps.I'm finding this more often then ever.
It's been suggested recently that caps in a voltage doubler circuit should have a higher DC working voltage than the 50 volt surge buffer used in most vintage gear.Your amp runs at 440 B+ so Fisher used 250V sections.Current wisdom dictates that those values be increased to 350-400 vdc per section.
Good Luck
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Follow Ups
- Re: Is my old can cap O.K.? - scrooie looie 14:04:21 12/26/03 (2)
- Re: Is my old can cap O.K.? - Jimmy 08:51:10 12/27/03 (0)
- I think so... - koo 06:39:28 12/27/03 (0)
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