Best resistors for F-5 and B1 mezmerize

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saabracer23

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Joined 2006
#1
Just curious what opinions are out there on the best resistors to use in these Pass builds. I’ve used PRP in the past in a Dynaco ST-70 build. With it being tube I’m sure it’s not the highest resolution, but I’ve read some less than thrilled reviews on them. So I’m thinking of trying out either Takman or Vishay/Dale. I’m liking the Takman, because they are cheaper, have both metal film and carbon film (the build threads show that carbon film is preferred in some places), and every value is available in the Takman. For whatever reason I can’t find a lot of common values in the Dale, like 220k. I can find 221k which I know it doesn’t matter, but some values the closest are even more off. This is with Mouser at least.

So just wanted to gather some thoughts before I place any orders.

Dan
 
#2
The usual Dale parts stocked are 1% tolerance (some are 0.5% to 0.1%), so the values are from the standard 1% series.
http://www.vishay.com/docs/31001/dectable.pdf

The values you are used to are from the standard 5% or 10% series. All series have industry standard values,
which are calculated from a formula for any value, within the stated tolerance. For example, if you want
a 337 ohm 1% resistor, use the closest number from the 1% series, which is 340.
Standard Resistor Values - RF Cafe
 
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#3
rayma said:
The usual Dale parts stocked are 1% tolerance (some are 0.5% to 0.1%), so the values are from the standard 1% series.
http://www.vishay.com/docs/31001/dectable.pdf

The values you are used to are from the standard 5% or 10% series. All series have industry standard values,
which are calculated from a formula for any value, within the stated tolerance. For example, if you want
a 337 ohm 1% resistor, use the closest number from the 1% series, which is 340.
Standard Resistor Values - RF Cafe
Click to expand...

So you’re saying that they’ll have those “missing” values in a different tolerance? I was just using 220k as an example because I made a list of the resistors ill need for the B1 Mezmerize and it calls for a 220k 1% and that value exists within the Takman lineup along with most any other brand. I couldn’t find it (through Mouser only, could be elsewhere) in the Dale lineup. Of course the 221k would work just fine as that is within the 1% tolerance and I’m sure it’s spot on 221k. Regardless I’m sure if I went with Dale I could easily populate the board with values that would work. I have many of the CFM55 series so would likely stick with that if possible. Are those fairly decent?

Dan

I’m sorry, maybe I didn’t get what your were saying. Do you have any experience with the Takman or Dale? Just curious about your thoughts.
 
#6
I have used prp, dale and Takman metal film.

I have built 2 identical preamps...one with dales and one with takman metal film. The takman sounds darker...although there is no way to tell for sure if it’s the resistors.

I’ve had PRP break the lead when bending. Not good. But I think they sound good.
 
#7
For source power resistors where we usually see the venerable light blue colored Panasonic ERX series circa 0.22R, 0.47R, 0.68R, etc in 3W, I have found that the KOA BPR non-inductive serpentine (sometimes just a "U" shape) solid metal reistors measure with lower distortion than the ERX, or any other type, including metal thin film axials (which are typically spiral laser trimmed).
 
#8
Hikari1 said:
I have used prp, dale and Takman metal film.

I have built 2 identical preamps...one with dales and one with takman metal film. The takman sounds darker...although there is no way to tell for sure if it’s the resistors.

I’ve had PRP break the lead when bending. Not good. But I think they sound good.
Click to expand...

Thank you all for your input thus far. It is certainly helping.

Hikari1, I’ve never had the PRP break on me. If you were to build the preamp now, just one time and had to choose between the 3, which would you choose? I know sound enjoyment is subjective, but I just want to know what you would want.

Not sure I like the idea of the sound being dark, if it was the resistors. Was it too dark, did you enjoy the sound at all?

Dan
 
#9
I use mostly Dale now and just don’t worry about it. Easy to get from Mouser, sound good, codes are easy to read. Takman have banded codes which I don’t like.

The difference between the 3 brands is probably subjective. If I was building a circuit known to be bright I would choose Takman. If the circuit is slow and dark I would choose PRP.

On an F5 there are far more important things to worry about. A change in .25A of bias will far outweigh any changes in resistor brand.

My F5 has PRP resistors and Panasonic blue for source resistors. Best choice? I don’t know...it is what I had on hand. Sounds good though. But probably because of the sikorel psu caps, chokes in the power supply and toshiba mosfets...not the resistors.
 
#12
saabracer23 said:
So basically I’m over thinking it. Just pick one and go with it?

If anyone else has anything they think I should hear let me know!

Dan
Click to expand...

in Papa's construction , your logic of using 220K instead of 221K is perfect

same applies for , say , 220R instead of 221R

in most positions (not all , most!) in Papa's constructions , you can err +/-5% without any trouble

if in doubt ,just ask

issue of choosing type of resistor ..... I leave that to other Greedy Boyz
 
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