resistor brands

[tmbg]

Anyone have any opinions about Xicon metal films vs KOA/Speer 1%?

KOA/Speer has 50ppm and 100ppm parts, the 50ppm are a goodly bit more expensive than the xicons, but the 100ppm parts are much much cheaper in small quantities.

What exactly is the 50ppm vs 100ppm?



I'm about to build out 4 more greens, and I wanted to go all metal film in these, but nine cents per resistor is pretty harsh. The KOA/Speers are 3c apiece. Are the KOA/Speers better or worse than 5% carbon films, of which I have PLENTY on hand?

Are they enough worse than the xicons to warrant spending three times as much?

 

[Gus]

my green is built with carbon films. I measured each one to match two channels.

 

[asm]

carbon vs metal film =
??

 

[Gus]

People build some stuff with carbon comp, carbon film and metal film.

The noise change from the films carbon to metal is not as much as reading about it. In the AOE there is a good section on noise of resistors, interesting read.

The stuff is cheap, BUILD and TRY things. Plate Rs in tube circuits are something to learn about but at lower voltages film type is not a big deal unless you want matched resistors without measuring them IMO.

 

[tmbg]

well that's the thing, I just mostly wanted to match 4 channels without spending a million years, so I opted to go 1%. I'm trying to shave costs in places where I can; without buying 100 qtys (which I can't really do for a dozen values right now), the KOAs are a LOT cheaper than the xicons for the 100ppms. Using the KOAs saves me $4 for four channels.

I'm gonna omit the entire meter section on these four, I never got the meters working on the two I have now, and I can add them later if I want. I also decided to omit the phantom, polarity, and HPF switches on these four. The only ones I see myself really needing is the HPF, and again, I can add them later. the first two I built has all three switches. Omitting those three switches saves $10 *per channel*. Yeah, I can definitely use that extra $40!