[R-390] killer and mica caps

[Charles Steinmetz]

Larry wrote:

> I am all for finding a longer life cap for C553.  Does anyone know of any tests done by independent testers?

I have tested hundreds of capacitor types for both performance and 
reliability, many for extended periods.  Any large, reputable capacitor 
manufacturer's 600v film-and-foil types will outlive you and the next 
four or five owners of your radio.  Just install them and you will never 
have to give capacitor reliability another thought.

I'm particularly fond of the SBE Orange Drop film-and-foil caps (Types 
225P, 418P, and 715P) and can vouch for them without hesitation.  The 
715Ps use polypropylene film, which makes more ideal capacitors than 
polyester (which is used in the 225Ps and 718Ps) -- but the 715Ps are 
larger, value for value.  I've used all three in radios, and have never 
been able to hear or measure any difference in performance.

Note that others are marketing *metallized film* caps with an orange 
epoxy coating, and calling them "Orange Dips" and the like, in an 
attempt to trade on the good reputation of SBE Orange Drops.  Do not be 
misled!  Conversely, Sprague, CDE, and Vishay have all, over the years, 
marketed SBE Orange Drops, so you will find genuine ODs marked with 
those brand names (and the same SBE Type numbers, 225P, 418P, and 715P).

Finally, stay away from the audiophile capacitor brands -- most of those 
are made by small manufacturers that shouldn't really be making 
capacitors, and the failure rates can be shockingly high.

Best regards,

Charles