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AKSA's Lender Preamp with 40Vpp Output
AKSA's Lender Preamp with 40Vpp Output
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Old 4th April 2020, 04:11 PM   #1281
pinnocchio is offline pinnocchio  Canada
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So far the combo is sounding really nice! Nice work on the AKSA Lender!

Do
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Old 4th April 2020, 06:45 PM   #1282
vlv81 is offline vlv81  New Zealand
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AKSA's Lender Preamp with 40Vpp Output
Hi all

Finally starting to put my Aksa Lender together. I missed a couple of things on my parts order so hopefully they will arrive eventually and I can finish it up. In the mean time I was reading my notes on the build and it reminded me of post number 1035. Very slightly off topic but I can't wait to hear this through the AKSA. I would like to thank Maty Tinman for bringing Ahmad Jamal's album "Ahmad's Blues" to my attention last year, something I never would have heard otherwise. It certainly has many elements that make it a very good listen. Whilst I'm not a particular fan of Jazz I have enjoyed it live many many times, mainly for the live sound and the atmosphere in some clubs/bars. It really is a good listen whether you like Jazz or not.
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Old 7th April 2020, 05:34 AM   #1283
vlv81 is offline vlv81  New Zealand
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AKSA's Lender Preamp with 40Vpp Output
Default Progress

Hi all

Progress picture, which has hopefully attached, and a question or two. I will be separating the boards but have just kept them together while I'm working.

I am just waiting on a couple of pieces to finish the pre-amp up such as R10 and R11, originally I had 10k and 1k but have since decided to order 33k and 6k8 after reading a post from XRK earlier in the thread. All that's left is arrival of a chassis and some time to finish it. However, I have also ordered the incorrect toroidal inductor from Mouser 2300HT-220-V-RC. The datasheet link:

https://nz.mouser.com/datasheet/2/54...ies-776374.pdf

The correct part from Farnell is a Wurth 744017. The datasheet link:

http://www.farnell.com/datasheets/25...401.1585897469

Apart from the fact I would have to mount the inductor off the board, as its physically a bit larger, the DC Resistance Max is 0.008R compared to the Wurth 0.015R Max and higher current rating would the 2300HT from Mouser be useable?

Thanks in advance
Attached Images
File Type: jpg Inductor.jpg (467.6 KB, 261 views)
File Type: jpg Progress.jpg (437.1 KB, 262 views)
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Old 9th April 2020, 09:55 AM   #1284
gaetan8888 is offline gaetan8888  Canada
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Hello

Anybody compared the AKSA's Lender Preamp with opamp preamp using the best sounding opamp ?

Thank

Bye

Gaetan
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Old 16th April 2020, 11:41 PM   #1285
pinnocchio is offline pinnocchio  Canada
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Just bought the TKD potentiometer for it. I had bought a cheap potentiometer for testing purposes but will be installing the TKD shortly.

X,
Do you have a specific grounding scheme for this preamp? On my preamp I'm totally fine but the one from my friend has this giga hum... He's got a set of MoFo monoblocks that when connected create a huge loud hum. If he only connect a single channel at a time it is totally fine and when using just headphones it is fine. The power for the AKSA is SMPS brick. It is not in a final chassis yet, I don't believe so. Just if you have ideas to try out. On my AKSA Lender I'm using a Sigma 22 (just - and + and leaving the ground floating) and it is totally silent. I know sometimes SMPS will cause noise like this. The MoFo's are also using SMPS bricks.

All the best!
Do
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PREAMPs : AMB α10 + USSPA | LDR3x + USSPA | AMPs: AMB β24 | USSA5 | TGM8 | VZ Audio NS OPS | FC-100 | Modulus-686 |
DACs : Mirand AK4490 + Discrete Output | Ian Dual ES9038K2M | Speakers : Troels Gravesen ATS-4 | Sagwee LT V3 |
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Old 4th May 2020, 12:12 AM   #1286
pinnocchio is offline pinnocchio  Canada
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Quote:
Originally Posted by pinnocchio View Post
Just bought the TKD potentiometer for it. I had bought a cheap potentiometer for testing purposes but will be installing the TKD shortly.

X,
Do you have a specific grounding scheme for this preamp? On my preamp I'm totally fine but the one from my friend has this giga hum... He's got a set of MoFo monoblocks that when connected create a huge loud hum. If he only connect a single channel at a time it is totally fine and when using just headphones it is fine. The power for the AKSA is SMPS brick. It is not in a final chassis yet, I don't believe so. Just if you have ideas to try out. On my AKSA Lender I'm using a Sigma 22 (just - and + and leaving the ground floating) and it is totally silent. I know sometimes SMPS will cause noise like this. The MoFo's are also using SMPS bricks.

All the best!
Do
Got the chassis and now waiting on volume knob, potentiometer and source selector extension and RCA jacks. 3 weeks of waiting already. Everything is so slow these days!

Do
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PREAMPs : AMB α10 + USSPA | LDR3x + USSPA | AMPs: AMB β24 | USSA5 | TGM8 | VZ Audio NS OPS | FC-100 | Modulus-686 |
DACs : Mirand AK4490 + Discrete Output | Ian Dual ES9038K2M | Speakers : Troels Gravesen ATS-4 | Sagwee LT V3 |
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Old 7th May 2020, 03:51 PM   #1287
dliscomb is offline dliscomb  United States
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Default Potentiometer possibilities

Now that my MoFo amp(s) are back in service , I'm getting my parts list for this preamplifier in order.

As such, I have a few questions about potentiometers:
  1. Is there really a compelling 20x quality reason to justify using the TKD potentiometer instead of the ALPS? Are they not both carbon-based?
  2. Among the list of potentiometer types is "carbon", "cermet", "plastic", and "metal". The reasons I have seen involve heat dissipation, but given the application, that shouldn't be an issue. I'm more interested in sound quality and reliability, especially since this application has the potentiometer 'in the path'. "Plastic" is recommended for 'smoothness'. Why choose one type or the other?
  3. Is there some known failure or quality problem with the "old style" big, round, perfboard-type potentiometers? Something like Bourns PDB18 series.
  4. Resistance taper profiles. Oy vey. Audio? Linear? What? 'Linear' vs. 'Swoosh' vs 'Zener' profiles? School me.
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Old 7th May 2020, 04:03 PM   #1288
pinnocchio is offline pinnocchio  Canada
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Quote:
Originally Posted by dliscomb View Post
Now that my MoFo amp(s) are back in service , I'm getting my parts list for this preamplifier in order.

As such, I have a few questions about potentiometers:
  1. Is there really a compelling 20x quality reason to justify using the TKD potentiometer instead of the ALPS? Are they not both carbon-based?
  2. Among the list of potentiometer types is "carbon", "cermet", "plastic", and "metal". The reasons I have seen involve heat dissipation, but given the application, that shouldn't be an issue. I'm more interested in sound quality and reliability, especially since this application has the potentiometer 'in the path'. "Plastic" is recommended for 'smoothness'. Why choose one type or the other?
  3. Is there some known failure or quality problem with the "old style" big, round, perfboard-type potentiometers? Something like Bourns PDB18 series.
  4. Resistance taper profiles. Oy vey. Audio? Linear? What? 'Linear' vs. 'Swoosh' vs 'Zener' profiles? School me.
Hi dliscomb,

Let's not get in the debate of conductive plastic sounds "smooth" as this is very subjective and in reality, if you put your mind into thinking something sounds a certain way, you might end up hearing it this way.

The TKD offers way better tracking than the cheap 3$ pot and I know because I've tested many times the scenario. They use conductive plastic which shouldn't rendering differently soundwise if another type of potentiometer is well designed. Carbon tend to change after some time where conductive plastic and cermet are not really affected. In essence, a stereo log pot using carbon would be more prone to be affected by tracking in the long run, it doesn't mean it is not as good though. For this preamplifier, the TKD makes a very good difference with tracking, especially at low volume.

I hope this helps a little.

Do
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DACs : Mirand AK4490 + Discrete Output | Ian Dual ES9038K2M | Speakers : Troels Gravesen ATS-4 | Sagwee LT V3 |
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Old 7th May 2020, 04:48 PM   #1289
dliscomb is offline dliscomb  United States
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Thanks, Do.

Quote:
Originally Posted by pinnocchio View Post
conductive plastic sounds "smooth" ...
Ah, sorry, I was imprecise. I meant that I had read that the "feel" of turning the potentiometer is (allegedly) smoother on the "plastic" types.

Kind regards,
Drew
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Old 7th May 2020, 05:22 PM   #1290
dliscomb is offline dliscomb  United States
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Ah, "tracking" in this domain means how closely the two resistors match as you turn the shaft.
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