Hey now,
I am building a pass b1 pre amp and he uses Vishay RN55D type. I can't find any of the values I need in 1/4w so I am wondering what I can use as a substitution, but just as good in quality.
I believe the RN55D is a metal film resistor? Here is the link to the schematic:
https://www.passdiy.com/pdf/B1 Buffer Preamp.pdf
I am building a pass b1 pre amp and he uses Vishay RN55D type. I can't find any of the values I need in 1/4w so I am wondering what I can use as a substitution, but just as good in quality.
I believe the RN55D is a metal film resistor? Here is the link to the schematic:
https://www.passdiy.com/pdf/B1 Buffer Preamp.pdf
These should get you started.
RN55D2213FB14 Vishay / Dale | Mouser
RN55D1004FB14 Vishay / Dale | Mouser
RN55E are better quality at 25 ppm tempco; Dale PTF series are down to 5 ppm, which is close to the quality of bulk metal foil resistors but not nearly as expensive.
C, D, E and other letters refer to the temperature coefficient rating of the resistor; D is 100 ppm, which is typical of metal film resistors. Carbon film resistors are 200 ppm or higher.
C, D, E and other letters refer to the temperature coefficient rating of the resistor; D is 100 ppm, which is typical of metal film resistors. Carbon film resistors are 200 ppm or higher.
What makes a bulk metal foil sound better isn't it's temperature coefficient, but it's low self noise and ease of passing a signal across it's molecular boundaries.
Agreed, but low Tc is a significant contributor to the most linear resistors. Low Tc wirewound resistors are also excellent, mostly for the same reasons. I always chose low Tc resistors whenever I have a choice and the quality of the part is important.
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