[Amps] SB-220

[Dennis12Amplify at aol.com]

In a message dated 11/3/04 3:14:14 PM Central Standard Time, r at somis.org  
writes:

The  mechanism 
that allows a parasitic oscillation in a pair of 3-500Zs is the  0.3pF 
of C between the anodes and the cathodes.  0.3pF seems pretty  trivial 
until one discovers that it amounts to a feedback path of c.  
-j5000-ohms between the output and the input.



>At what frequency?  
 
 >It would have to be over 100MHZ to be that low of a  number!
 
>Dennis O.