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Picking resistors
Picking resistors
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Old 9th October 2019, 11:14 AM   #1
carlmart is offline carlmart  Brazil
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Join Date: Mar 2001
Location: Brazil
Default Picking resistors

I am in the process of picking parts for a power amplifier clone I'm working on and two MM RIAA preamps.

As I am a firm believer, based on many tests we made with a friend, that resistors can make an audible difference (note that I used the word "difference", not improvement), I have been trying to select the parts carefully.

Basing my choices on Mouser availabilities and on Parts Connexion options (some expensive boutique parts), I am making my Excel list with two choices.

For the PC options I centered on PRP resistors, which some people consider a very good compromise for a reasonable price. Even if PRPs can cost twice the price of Mouser's, that is not always the case.

So I think I need further comments on what options to go for, at least for non-critical position parts. So let's state that what I consider "critical" are load resistors for RIAA preamp and feedback resistors for both power amps and preamp.

I would appreciate some further hints, on what you have been using that did add interesting things to the audio quality. And used where.

Lately I have been recommended to prefer Vishay-Dale types, which are not available for every value.

But the quiz part for me is PRP, as I am not sure if they deserve a shot.

Suggestions and comments are welcome.
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Old 9th October 2019, 12:24 PM   #2
schiirrn is offline schiirrn  Germany
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Join Date: Nov 2018
Most positions are "non critical". Are you building solid state or tube gear? Mouser is a good option for picking parts as their search filter is pretty good. When you want stability and low drift e.g. for feedback resistors tricks like picking 4 resistors of the needed value and wiring two in series and then paralleling them.
When you hear a difference between resitors in a certain position check stability of the node on a scope. It might be a sign that the circuit oscillates and the miniscule differences in parasitcs change the behaviour of the instability.
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Old 9th October 2019, 01:23 PM   #3
carlmart is offline carlmart  Brazil
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I only build solid state. I'm scared of tube gear high voltages.
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Old 9th October 2019, 03:18 PM   #4
Mark Tillotson is offline Mark Tillotson
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Join Date: May 2018
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Stick to metal film, and use precision parts where this matters (thermal coefficient is better with higher precision resistors too, note).


These days 1% metal film are not expensive and the go-to resistor for everything.



For surface mount "thin-film" means metal film, they are more expensive though, so only
choose them for the critical positions.
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