TKD 2P-2511S - 21 steps replacement AN Kit One - diyAudio
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Old 18th June 2015, 12:46 AM   #1
beto1 is offline beto1  Chile
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Default TKD 2P-2511S - 21 steps replacement AN Kit One

Hello All,
I have to replace my TKD 2CP2511 volume pot on my AN-KIT 1, which is 10 years old and is beginning to fail. I was thinking of replacing it with the 2P-2511S TKD 21 steps, stepped attenuator that has the same size so it is very simple to replace.This series attenuator has the first steps with 2dB increments (Attenuation (BTS-50dB) 0, 2, 4, ...(2dB step)... , 30, 32, 34, 37, 42, 50), so i'm a little concern because I will build a pair of 97 dB sensitivity speakers and I don't know if will get too louder at the first or second steps.
My second choice is an Acoustic Dimension 41 steps series attenuator, but it wont fit without a big modification as my amp has the volume pot in the center with a reduced internal space that barely fit the TKD.
Any comment will be wellcome.
Regards

Last edited by beto1; 18th June 2015 at 01:47 PM. Reason: to complete statement of the topic
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Old 18th June 2015, 07:46 AM   #2
AndrewT is offline AndrewT  Scotland
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What is the output voltage of your Source?
What is the maximum signal at the speaker?
What is the gain between the Source and the Speaker?
What attenuation do you need to prevent clipping?
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Old 18th June 2015, 08:11 AM   #3
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If the 2CP-2511 has been working fine for you why don't you just replace it with another 2cp-2511? Parts Connexion has them in stock and they have a 20% off sale until the end of June.
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Old 18th June 2015, 10:22 AM   #4
EUVL is offline EUVL  Europe
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You can still use the 2P-2511S and tailor fit to your attenuation requirements by replacing the resistors inside.
Then you can get whatever total impedance, taper and max. attenuation you might want.

Another lower cost option is to buy a "fake" RH2702 and replace all the resistors with Susumu thin film (0.5% or better).
This also gives you the same flexibility as mentioned.

Both options above are so-called series stepped attenuators.
Here is a solution for a ladder type that will fit into the same small volume.
BUT still work in progress.

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Old 18th June 2015, 02:38 PM   #5
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Quote:
Originally Posted by AndrewT View Post
What is the output voltage of your Source?
What is the maximum signal at the speaker?
What is the gain between the Source and the Speaker?
What attenuation do you need to prevent clipping?
Sorry Andrew, I can't answer those questions.
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Old 18th June 2015, 02:47 PM   #6
beto1 is offline beto1  Chile
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Quote:
Originally Posted by nanchangbob View Post
If the 2CP-2511 has been working fine for you why don't you just replace it with another 2cp-2511? Parts Connexion has them in stock and they have a 20% off sale until the end of June.
Hello nanchangbob, I just want to try a new one after 10 years. I recall that was a huge improvement over the stock cheap pot. As far as I know this resistor based attenuator have a better channel match and more transparent sound. The cost difference between the 2CP and 2P is not that big and if this sound a little better, will be wellcome.
Thanks for answer.
Regards
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Old 18th June 2015, 03:08 PM   #7
beto1 is offline beto1  Chile
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Quote:
Originally Posted by EUVL View Post
You can still use the 2P-2511S and tailor fit to your attenuation requirements by replacing the resistors inside.
Then you can get whatever total impedance, taper and max. attenuation you might want.

Another lower cost option is to buy a "fake" RH2702 and replace all the resistors with Susumu thin film (0.5% or better).
This also gives you the same flexibility as mentioned.

Both options above are so-called series stepped attenuators.
Here is a solution for a ladder type that will fit into the same small volume.
BUT still work in progress.

The DAO SE all-FET Class-A ZGF Headphone Amplifier


Patrick
Thanks Patrick !
A ladder attenuator in an small size is just what all people are wanting.
Regards
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Old 18th June 2015, 03:10 PM   #8
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by beto1 View Post
Sorry Andrew, I can't answer those questions.
If you want to predict this before you buy, the you need the answers.
Quote:
I don't know if will get too louder at the first or second steps.
we can't tell you.
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Old 21st June 2015, 05:35 PM   #9
nezbleu is offline nezbleu  Canada
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Quote:
Originally Posted by beto1 View Post
This series attenuator has the first steps with 2dB increments (Attenuation (BTS-50dB) 0, 2, 4, ...(2dB step)... , 30, 32, 34, 37, 42, 50), so i'm a little concern...
OK, so what is the attenuation of your current volume control in its first few steps? What is the attenuation of your current volume control in the rotation range where you use it the most?
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Last edited by nezbleu; 21st June 2015 at 05:38 PM. Reason: afterthought
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Old 21st June 2015, 08:39 PM   #10
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Quote:
Originally Posted by nezbleu View Post
OK, so what is the attenuation of your current volume control in its first few steps? What is the attenuation of your current volume control in the rotation range where you use it the most?
Hello Nez Bleu,
my current volume pot (CP2511) is very similar to the stepped attenuator (C2511), but the main difference is that the C has from 100% attenuation to the first step has an increment of 8dB, then has 7dB to the second step, then 3 dB to the third step and the CP get the same, but in a continuous path. I used to heard between the 1/2 position to 1/4 on my room with my current 91 dB sensitivity speakers, but I will build a speaker pair with 97 dB soon, so maybe this few first steps from 100% attenuation to 1/4 of the turn would be hard to set fine tuning control.
I don't have all the data to calculate the system gain, but I am trying to get now.
Best regards
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