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Aksa Lender HPA
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Old 17th January 2018, 09:39 PM   #11
Max Headroom is offline Max Headroom  Australia
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Originally Posted by xrk971 View Post
I get a lot of questions on those caps! LOL
they were only about $1.60ea and yes, from Aliexpress. I literally used them to give a nice racy look to a bland looking green PCB!
Humble Homemade Hifi - Cap Test
Quote:
They have a slightly different character to a standard MKP like the Intertechnik Audyn Cap QS4, just to name one of many. The "Audiophiler" has an emphasis on the lower treble range making them a bit upfront or foward sounding. This nature does make them subjecively more dynamic which can work well in certain systems or with certain types of music such as solo piano or string quartets. Not completely neutral but they can be usefull in certain situations. They remind me a bit of the Solen PPE-MKP-FC in their presentation. Play vocals and they can get a bit shouty sometimes. Compared to a Bennic FPP the "Audiophiler" are slightly rougher, less smooth. All in all not bad but also nothing special. Like the Solen they are a good step up from standard MKT capacitors often found in factory built speakers in being a fraction more spatial and open.
Dan.
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Old 17th January 2018, 10:27 PM   #12
xrk971 is offline xrk971  United States
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Wow, nice website comparing caps there! Thanks, Dan

The ChiFi red cap scored a tad better than Jantzen Crosscap and costs 20x less

I see the kilobuck Duelunds really scores well. 15 vs 7 or 8 in typical cap.
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Old 18th January 2018, 05:44 AM   #13
xrk971 is offline xrk971  United States
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Default All cased up

A very utilitarian aluminum Bud box...
The DC-DC step up is one of the flat metal core ones, and is mounted underneath the main PCB attached directly to the bottom wall with a layer of Kapton in between. 5.5mm barrel jack for power in from either a SMPS laptop supply or Class 2 wall transformer (12v 1A works well). RCA input jacks on the back. Power indicator light on rocker switch and separate LED shows voltage on the PCB after the cap Mx charges up.

Aksa Lender HPA-aksa-lender-hpa-amp-01-jpg

Closeup showing DC booster mounted underneath main PCB:
Aksa Lender HPA-aksa-lender-hpa-amp-02-jpg

Aksa Lender HPA-aksa-lender-hpa-amp-03-jpg
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Last edited by xrk971; 18th January 2018 at 05:47 AM.
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Old 18th January 2018, 08:51 AM   #14
Harry3 is offline Harry3  Australia
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Hi X,
are you running the risk of adding noise/ distortion to the main board by have the DC-DC boost board underneath it?
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Old 18th January 2018, 12:54 PM   #15
xrk971 is offline xrk971  United States
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Good question - I couldnít hear anything but the FFT will tell all. Let me measure it when I get a chance later today. Itís a 400kHz switcher so noise will be well above audio band and hopefully absorbed by the filtering.
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Old 19th January 2018, 04:23 AM   #16
xrk971 is offline xrk971  United States
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Originally Posted by Harry3 View Post
Hi X,
are you running the risk of adding noise/ distortion to the main board by have the DC-DC boost board underneath it?
The proximity of the DC-DC step up doesn't seem to affect the noise pickup on the board at all. These are some of the lowest noise background measurements I have seen. Here is 2.0Vpp into 42ohm load.

Aksa Lender HPA-aksa-lender-hpa-130ma-2-0vpp-43hms-png
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Old 19th January 2018, 05:05 AM   #17
xrk971 is offline xrk971  United States
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I let the amp warm up for a bit and put the cover on and the THD dropped down to 0.01% from earlier value of 0.023% for 43ohms and 2.0Vpp:

Aksa Lender HPA-aksa-lender-hpa-130ma-2-0vpp-43ohms-png
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Last edited by xrk971; 19th January 2018 at 05:09 AM.
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Old 19th January 2018, 06:47 AM   #18
Harry3 is offline Harry3  Australia
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Old 19th January 2018, 10:46 AM   #19
Max Headroom is offline Max Headroom  Australia
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Originally Posted by xrk971 View Post
I let the amp warm up for a bit and put the cover on and the THD dropped down to 0.01% from earlier value of 0.023% for 43ohms and 2.0Vpp:
Is this THD reduction due to temp, or due to the cover ?.
I have noted change in amplifier sound according to no cover, steel cover, aluminium cover or timber cover....same amp, covers belonging to other amps in the shop at the time.

Dan.
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Old 19th January 2018, 02:53 PM   #20
xrk971 is offline xrk971  United States
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I don’t know - I should have the FFT running and pull the cover off. It’s an unexpected change bough. Quite significant.
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