[dumbears]

I'm going to DIY a META42. I wonder what resistor I should use? Sb recommended me in using Welwyn resistor (RC55Y/RC55C/MFR4).

Do anyone of you have experience in using these series of resistors? What brand resistors would you recommend?

Thanks!

 

[Pars]

What brands do you have available at a reasonable price? The Welwyns are supposed to be pretty good (never used them as they aren't available in the US... think they are the same as the IRCs that Mouser sells). Dales are good, typically the RN55/60s are used here, but the CCFs, etc. are also supposed to be fine. I've used BC SRF25s and like them as well. I've also used Roderstein Resistas, but they are discontinued and you can't find all (many) values.

 

[firefox360]

Seems like many people recommend the Vishay Dale RN55's 0.1% for through-hole purposes.

 

[tangent]

Quote:

Originally Posted by firefox360 /img/forum/go_quote.gif Seems like many people recommend the Vishay Dale RN55's 0.1% for through-hole purposes.

There's no point to 0.1% resistors in a circuit like the META42. Where accuracy matters is in the matching between the channels, not in absolute values within the channels.

If you want 0.1% matching, it's more economical to hand-match them from larger batches of 1% resistors. This is perfectly legitimate for the type of circuits we discuss here. This does require a fairly good meter, but you can pay for it from the savings of around 100 resistors. If you look at it as a way to save money on precision resistors, it's like getting the meter free after a couple of projects.

 

[Daroid]

I just use MRS25 if i can and match them. I don't bother with carbon resistors for non-signal path purposes any longer, the costs aren't much lower compared to metal film any longer to justify this

For power purposes i use BC PR0x series due to the relative small dimensions.

Headphone amps aren't situated in high temperature areas, and especially an op-amp based circuit like the META42 shouldn't draw any power in the magnitudes to even require 1/4W resistors.

 

[Sinbios]

Even for channel matching, could anyone REALLY detect the difference of 0.1% between the channels? The human ears are not exactly perfectly matched either, and I doubt your sound equipment is matched to 0.1% between the channels. Personally I think 1% resistors are fine for most audio applications.

 

[AndrewFischer]

I use mil-spec metal films for most audio work. RN55DxxxxF generally, RN60 or even RN65 when needed. I've never used the higher tolerance or PPM parts. (RN55CxxxxB etc.)


I use generic 1% metal film resistors for just about everything else. In qty. 200 there just isn't any reason to use 5% or carbon resistors anymore.

 

[Sinbios]

Quote:

Originally Posted by AndrewFischer /img/forum/go_quote.gif I use generic 1% metal film resistors for just about everything else. In qty. 200 there just isn't any reason to use 5% or carbon resistors anymore.

Was there ever? XD

 

[FallenAngel]

Quote:

Originally Posted by Sinbios /img/forum/go_quote.gif Was there ever? XD

Yep, signal path, some might sound better.

 

[HIPPOhifi]

We use:

Surface Mount: Multicomp
Through hole: Vishay/Dale

5%/1%/0.1% hand matched, depending on application.

 

[amb]

Quote:

Originally Posted by FallenAngel /img/forum/go_quote.gif Yep, signal path, some might sound better.

"Sound better" by virtue of carbon resistors' high noise and instability? LOL.

 

[Sinbios]

Quote:

Originally Posted by amb /img/forum/go_quote.gif "Sound better" by virtue of carbon resistors' high noise and instability? LOL.

This sounds suspiciously like the vinyl/CD/tube/IC debate ;P

 

[FallenAngel]

Quote:

Originally Posted by amb /img/forum/go_quote.gif "Sound better" by virtue of carbon resistors' high noise and instability? LOL.

Most likely

I did enjoy the Kiwame as output resistors much more than the Dales in the Soha.

 

[dumbears]

Thanks folks.

I remembered sb saying that different brand resistors sounded differently. Is this true?

Any thoughts?

 

[threepointone]

different brand resistors with the same specs? probably voodoo.

The only spec other than the obvious (tolerance, temp stability in some circuits, etc.) I would believe to any extent would have an effect on the sound is their noise spec (though its effect is at most probably just barely within the limits of human hearing). Dale RNxxs have the lowest current noise specs I've seen so far. For SMD components, don't count on the Vishay reputation in THM stuff; the standard SMD 1% resistors mouser stocks have pretty bad ratings with respect to this. KOA Speer SMDs (RKxxx series?) seem to have the lowest noise rating I've seen for SMDs, comparable to the vishay RNxx THMs