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In Reply to: RE: death cap question posted by gkargreen on March 14, 2017 at 17:20:33
Would it be appropriate to ask why you need to replace one of these? Many pieces of vintage gear never used them. Their original purpose was to shunt any RF picked up by the chassis to AC neutral.
In other words, are you replacing it because it's there or because there's an RF problem in this preamp's location?
This one is an old pyramid cap connected across the AC line after the fuse, these old Pyramids are pretty sketchy...
I looked over a few Scott preamps, and I believe only one used a capacitor on the AC. That one had a capacitor across the AC line for noise filtering. Across the AC line is technically not a death cap because it's not directly connected to the chassis.
That's right! So, I would just use another .02 ufd cap of the appropriate voltage, correct?
The LC-21 is the only Scott schematic I can see that uses a line filter capacitor, and that one is always under voltage whenever the preamp is plugged in. But it might be a running change in production in one of the others.
You might still get an X or X2 rated capacitor since these are designed as line filters, but any quality polypropylene capacitor would probably do.
I thought you were supposed to use a ceramic disk capacitor for this.
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