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AKSA's Lender Preamp with 40Vpp Output
AKSA's Lender Preamp with 40Vpp Output
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Old 31st January 2019, 08:05 AM   #1021
maty tinman is offline maty tinman  Spain
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dr.loudness Gillian Welch - Soul Journey

DR10

I do not think they are better than the famous Chinese DACT.

I have the older iFI iCAN headphones amp with the green RK09 and I do not like the potentiometer.

[Old image, link] http://maty.galeon.com/WP-imagenes/h...cker-x4-ME.jpg

iCAN SE

Click the image to open in full size.

At low levels the green RK9 does not work very well, there is an imbalance, which is a known problem.

Btw, it sounds better under the 3 mm galvanized steel sheet. The aluminum case must have thin walls, very thin. 1-2 mm, insufficient for atmospheric RF / EMI I have at home. A case with 1 mm steel sheet is better idea and cheaper.
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Last edited by maty tinman; 31st January 2019 at 08:31 AM.
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Old 31st January 2019, 08:34 AM   #1022
maty tinman is offline maty tinman  Spain
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ALPS RK09

[PDF] https://eu.mouser.com/datasheet/2/15/RK097-1370742.pdf

Quote:
9.5mm width potentiometer ideal for various types of control
ALPS RK271

https://eu.mouser.com/datasheet/2/15/RK271-1370748.pdf

Quote:
High performance potentiometer with excellent operational feel
Both, with 20% total resistance tolerance.
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Last edited by maty tinman; 31st January 2019 at 08:36 AM.
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Old 31st January 2019, 12:09 PM   #1023
ggetzoff is offline ggetzoff  United States
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Quote:
Originally Posted by maf_au View Post
The cheap DACT type attenuator finally arrived today. Sounds a bit better than the ALPS Potentiometer. Have them set so can swap them easy to test them.

Still waiting for the Mundorf Caps. Might add some caps (10u0, C1022,C1032) while waiting. If I run the volume up, the sound is crackling!!!

Ive been using those cheap DACT style from EBay for over 10 years and they are really good. Not just for money, just good.
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Old 31st January 2019, 03:00 PM   #1024
xrk971 is offline xrk971  United States
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AKSA's Lender Preamp with 40Vpp Output
Quote:
Originally Posted by maty tinman View Post
dr.loudness Gillian Welch - Soul Journey

DR10

I do not think they are better than the famous Chinese DACT.

I have the older iFI iCAN headphones amp with the green RK09 and I do not like the potentiometer.

[Old image, link] http://maty.galeon.com/WP-imagenes/h...cker-x4-ME.jpg

iCAN SE

Click the image to open in full size.

At low levels the green RK9 does not work very well, there is an imbalance, which is a known problem.

Btw, it sounds better under the 3 mm galvanized steel sheet. The aluminum case must have thin walls, very thin. 1-2 mm, insufficient for atmospheric RF / EMI I have at home. A case with 1 mm steel sheet is better idea and cheaper.
That looks like it may be a fake Alps RK09. The aluminum is discolored and dull and I believe they are machined shafts with a flat (in general). I use them all the time and have no issues with imbalance that is noticeable. They are quite smooth and quiet. I suppose the makethem in knurled shafts too but most of the ones I have seen are machined with a flat:

Click the image to open in full size.
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Last edited by xrk971; 31st January 2019 at 03:03 PM.
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Old 31st January 2019, 08:35 PM   #1025
maf_au is offline maf_au  Australia
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Quote:
Originally Posted by maty tinman View Post
Thanks for the info of the dr.loudness-war.info Never heard about that before.

So DR10 for the Soul Journey. Not in the higher values but not terrible. Sounds good here.

I decided to move to the DACT attenuator after reading about it in here and several other posts in diyAudio. Any members with it say they are very good. I don't know if other ALPS are as good or better, haven't ever had any type ALPS before to compare them.
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Old 2nd February 2019, 11:56 AM   #1026
maf_au is offline maf_au  Australia
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Started listening to some of my CD's. I'm amazed by some of them.

Many years ago, I bought a CD called "Same Mother, different father; by Ocaso" Made in 1998 in Melbourne Australia. Don't know if the CD is still available now. Runs two nylon string guitars and the third was doing Latin percussion. Can clearly hear each of the items and the direction of each of them. Never heard them like that before on any of the previous systems. Amazing!

The system now sounds way better than any version of system we have had and changed items since I started building an amp and speakers in around 1975.

Currently, the system is:
--> AKSA Lender Preamp
--> PASS Class A, single stereo Amp
--> Rotel RCD-965BX (around 1990 but good)
--> Topping D50 DAC
--> Rogers LS7 speakers (also around 1990)
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Old 2nd February 2019, 01:01 PM   #1027
xrk971 is offline xrk971  United States
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AKSA's Lender Preamp with 40Vpp Output
Hi Maf_Au,
Great to hear that the Aksa Lender is helping you to get the most out of your system. Which Pass Class A amp are you using?
Cheers,
X
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Old 2nd February 2019, 01:53 PM   #1028
maty tinman is offline maty tinman  Spain
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Default Rogers LS7t

Rogers LS7t loudspeaker Measurements | Stereophile.com

As can be seen from the plot of impedance amplitude and phase (fig.4), the LS7t represents an easy load for an amplifier to drive, staying above 8 ohms over nearly all the audio band. The port tuning can be seen at 40Hz.

Click the image to open in full size.


Rogers LS7t loudspeaker Specifications | Stereophile.com

Quote:
Description: Two-way, reflex-loaded, stand-mounted loudspeaker.

Drive-units: 1" titanium-dome tweeter, 8" polypropylene-cone woofer.

Crossover frequency: 3kHz. Crossover slopes: third-order, 18dB/octave. Frequency response: 55Hz–22kHz –2dB. Sensitivity: 88dB/W/m.

Nominal impedance: 8 ohms. Amplifier requirements: 15W minimum.
Imagine the sound with very good recordings and high/very high DR. Well, I think you will not need to imagine it
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Last edited by maty tinman; 2nd February 2019 at 02:16 PM.
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Old 2nd February 2019, 08:18 PM   #1029
AKSA is offline AKSA  Australia
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Thank you for your impressions, Maf. As many build the AKSA/Lender, more and more realise the sound quality. I have this circuit block in a commercial offering, the SAKSA, and it is highly rated by my customers.

Happy New Year!

Hugh
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Old 2nd February 2019, 09:17 PM   #1030
maf_au is offline maf_au  Australia
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Quote:
Originally Posted by xrk971 View Post
Pass Class A amp are you using?
Cheers,
X
Hi xrk, my Pass Class A amp is recent version 1.6
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