[R-390] Urban Legend Cap

[Charles P. Steinmetz]

Perry wrote:

>Charles has commented extensively about problems with film foil caps.

No, my comments have been about the problems with *metallized film* 
caps and how film-and-foil caps do not suffer from these problems.

>I will wager USD $1,000.00 that no one on this list can prove that 
>foil OD caps are measurably superior to the equivalent ceramic caps 
>in bypass applications in BA receivers.

I have repeatedly said that disk ceramics are superior to film caps 
-- including ODs -- for power supply bypass applications.  So, I 
would always choose disk ceramics over any film cap for bypass 
applications, and have said exactly that many times on this 
list.  Film caps are the caps of choice for signal coupling 
applications, so there are usually a few places in a BA where they 
are necessary.  And in those places, one should use film-and-foil 
caps rather than metallized film, for the reasons I have discussed.

Best regards,

Charles