[R-390] Capacitor Replacements Vitamin Q

[Barry]

Aren't BBODs paper?

Barry - N4BUQ


 On Mon 24/01/11 11:26 AM , Tisha Hayes tisha.hayes at gmail.com sent:
> A good rule to follow is to replace what is proven bad and leave the
> restalone, unless you have good reason.
> 
> Good reasons to replace capacitors;
> 1) They are paper
> 2) They are BBOD's
> 3) They are way out of spec
> 4) It is the "killer cap" on the mechanical filters
> 
> Wholesale replacement may sound like a nifty idea but you can end up with
> aradio that is seriously out of alignment if those caps are in the RF/IF
> deck.
> 
> I have tweaked with capacitor values in the audio section to improve
> frequency response and done a few AGC mods to eliminate the "moment of
> silence". Sometimes I change cap values in the B+ supply to reduce
> ripple(Chuck Ripple , ).
> 
> To a large extent, there is a similar set of rules for the wholesale
> replacement of resistors.
> 
> -- 
> Ms. Tisha Hayes/ AA4HA