[R-390] Resistors and capacitors in audio

[kc9ieq]

Hey Don, I don't disagree with anything you said here, but check out the Vishay PR02 series of metal film resistors.  They are rated for 500V, have a better temperature coefficient than pretty much all carbon films, (But not as great as some more expensive metal films), and are a brownish color which blends in pretty well in older equipment.  They have a 2W rating but are about the size of a 1/2W carbon comp. A little pricey compared to carbon films, but can often be found on sale at Newark!
Regards, Chris kc9ieq


Sent from my SMRTphone
-------- Original message --------From: Don Reaves <donreaves at gmail.com> Date: 9/27/17  4:42 PM  (GMT-06:00) To: R390A <r-390 at mailman.qth.net> Subject: Re: [R-390] Resistors and capacitors in audio 
This is an interesting reference site for resistors, published by a group
of University Technology of Eindhoven engineers in the Netherlands.

http://www.resistorguide.com/types/

I learned that carbon comp resistors can change 10% in value just sitting
on a shelf in a years time.  This explains the huge value shift in my NOS
carbon comp resistor hoard that I kept from my Dad's Radio-TV shop back in
the 70s.  The color codes now mean nothing.

I started a new hoard of freshly minted carbon film resistors, because they
are rated at 500 volts, are dirt cheap and they look better in a radio than
a metal film type.

Don
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