Systemic Development > Amplification and Preamplification
Power Resistors
steve:
When it comes to designs, say in cathode biased outputs, bypassing the power resistors
with good bypass capacitors does not alleviate the sonic effects that the power resistors
often cause.
I have found the Mills MRA resistors to be sonically exceptional. With that said, there is also an
MRB version. There is a physical difference.
1. The MRB incorporates a steel end cap where as
2. the MRA uses a "copper" end cap.
3. Both use copper leads
I have not compared the two for sonic differences, but wish that all become aware of the physical
differences. Material differences normally cause sonic differences.
Hope this helps.
steve
Folsom:
What are the negative effects you experienced with some?
I am not opposed to sandcast trials because the inductance might actually be useful in a tube circuit, especially if you have multiple tubes. I think they are no cap?
Funny, the MRA is made by Vishay and was the one I wanted to look up, but I thought Mills was a different company - it is only in the crossover/electronics world from old catalogs.
steve:
--- Quote from: Folsom on October 07, 2024, 12:32:51 PM ---What are the negative effects you experienced with some?
I am not opposed to sandcast trials because the inductance might actually be useful in a tube circuit, especially if you have multiple tubes. I think they are no cap?
Funny, the MRA is made by Vishay and was the one I wanted to look up, but I thought Mills was a different company - it is only in the crossover/electronics world from old catalogs.
--- End quote ---
Sorry for the delay Folsom, been ill and deer struck my car.
Sand resistors are inductive, steel lead wires and element materials used, each affecting the sonics in
a different way, and depending upon the placement in the circuit.
What I have noticed most is that Mills MRA give a relaxed, natural sound when used in wide
bandwidth circuit designs. However, using designs with limited bandwidth, such as 12AX7/12AT7
etc tubes, may give sensation of lacking highs. This is very general opinion.
By the way, Mills MRAs affect sonics differently than Dayton non inductive power resistors. I prefer the
Mills MRAs, just sounds more natural/accurate.
Mills was purchased by Vishay some years ago. Vishay seems to have a monopoly on resistors these
days.
cheers
steve
Nick B:
Hi Steve,
Just curious if you've ever tried the Amtrans AMRG resistors? I have them in my Hattor Big preamp which sounds terrific
Nick
steve:
--- Quote from: Nick B on November 28, 2024, 10:36:19 AM ---Hi Steve,
Just curious if you've ever tried the Amtrans AMRG resistors? I have them in my Hattor Big preamp which sounds terrific
Nick
--- End quote ---
Hi Nick,
No, I have not heard of them. But then I have not been in the parts scene that much for a
decade or so. I just checked and they are carbon film, which I do not recommend.
But that is me personally. Even between the Mills and Dayton non-inductive resistors (heavily
bypassed) I could discern a sonic difference in the output stage.
Cheers
steve
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