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In Reply to: RE: Not correct posted by Salectric on January 10, 2015 at 19:35:54
I think you clarified and confused at the same time. It was not described by the OP as an interstage coupling cap. If that is the case, then yes, you are correct that voltage is critical and a 630v cap should be used. However, please proofread your post. I think you meant to write: "a cap with INadequate voltage rating can fail by shorting..."
If the cap is NOT interstage, if it is input coupling or a bypass for an electrolytic, then voltage is of no importance. The OP might not know the difference or he should have stated it at the outset. In that case, perhaps he should not be fooling around with the dangerous voltages inside a tube amp at all. Just to be safe, he could use an equally high voltage cap, although that will limit the field of candidates.
Peace,
Tom E
Follow Ups:
"If the cap is ....... a bypass for an electrolytic, then voltage is of no importance."
So your assertion is that it would be perfectly acceptable to bypass a 450V electrolytic with say a 16V film cap?
One can only wonder why the engineer who designed the amp was so incompetant that he installed a 630V cap where a 25V or even 16V cap would be perfectly OK...
To the original poster: if you replace the 630V cap with a 16V cap stand well clear when you power up the device. I would advise that you wear safety glasses and have a fire extinguisher close to hand.
Thanks for catching the typo. I edited the text so it now refers to "inadequate voltage rating."
It is certainly possible there is an input coupling cap. This was fairly common back in the 1950s and 60s when there was more risk of a defective source or preamp leaking DC. It is not so common today. It is much more likely that the Line Magnetic amp has interstage coupling caps which is where the DC voltage rating is very important. A glance at the schematic would answer the issue. Perhaps the OP can post a copy.
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