Acurus L10 Preamp Mods & Schematic - Page 2 - diyAudio
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Old 3rd September 2013, 08:49 PM   #11
essepol is offline essepol  Denmark
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Default Siblings

Here is a little info on two of it's siblings that may be interesting. Acurus RL-11 and Aragon 28k.
Attached Images
File Type: png Acurus RL-11 schematic.png (30.2 KB, 330 views)
File Type: jpg RL-11 top.JPG (444.1 KB, 330 views)
File Type: jpg RL-11 underneath.JPG (398.3 KB, 297 views)
Attached Files
File Type: pdf Aragon_28-K_schematic.pdf (70.4 KB, 101 views)
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Old 3rd September 2013, 11:58 PM   #12
ammel68 is offline ammel68  United States
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Thank you for the additional photos and Aragon schematic. I understand the RL-11 is supposedly very similar to the L10 except for the RL-11 being remote controllable.

The Aragon I have no personal experience with. If someone here has heard both the Aragon and the Acurus, perhaps they can chime in with how the two compare sonically.
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Old 6th September 2013, 10:50 PM   #13
AVWERK is offline AVWERK  United States
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One Aragon version came with Penny & Giles attenuators.
Never heard it though

Regards
David
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Old 12th November 2013, 06:31 AM   #14
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I've actually got one of these laying around looking for a home if anyone's interested..
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Old 11th December 2013, 02:52 AM   #15
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Stumbled across this thread kind of late but thought I'd give my .02. I looked over the mods performed by Ken Ealey and I'm not liking what I see there. As others have stated he eliminated the +/- 18 V discrete regulators and is running full rectified voltage to the line stage DC rails. I have worked on a few of these Acurus pre's and the non-regulated voltage is usually around 29 -30 VDC with a good bit of ripple as one would expect. I would say that he is still CRC filtering the rails but now he only has 2 uF film caps where there used to be 1000 uF E-CAPS right after the 10 ohm 2W RC resistors so there is not a lot of storage after those resistors. It also looks like he removed the 10 uF output coupling caps and shorted those from underneath the board. The small electrolytic at the input to the line stage was also added by and I'm assuming it is a non-polar input coupling cap. I can think of no other purpose for it in that location. The Aragon Pre's used an input coupling cap and had the output directly coupled to the line stage. But they also offered a DC offset adjustment to trim the circuit.

Personally I just cannot see that preamp sounding better than the stock unit!

If it were me, I'd develop a current source for the stock complementary diff input. Then I'd turn my attention to the power supply. The stock transformer is only 5 VA and this pre draws about 3 - 4 VA in operation so the transformer is overloaded in my opinion. A 10 VA toroidal will fit nicely, but you will have to be resourceful and build a small bracket. Then a new larger set of main storage caps to replace the 3,300 uF/35v electrolytics (10mm pin spacing snap-in style) and then add a set of wima film bypass caps across the new E-caps on the backside of the board.

If you are feeling really energetic then the cheap metal films can be replaced with RN60D's. It is time consuming, but I've done it on a few of them. You might as well also replace the 1000 uF E-CAPS on the regulated side of the DC rails.
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Old 29th September 2014, 11:48 AM   #16
hcpower is offline hcpower  Denmark
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[QUOTE=Chamberman;3735018]
Personally I just cannot see that preamp sounding better than the stock unit! QUOTE]

I'm the Dane who had the thread on Hifi4All.dk. The Ken Ealey Mod takes the L10 to another level, and deliver far more details in the top, and deep controled bass. - Far deeper then stock.. The soundstage is superb also.

The Hifi4All thread has been deleted, in respect for Kens work.

Hope my English is readable

Thanks// K.Nielsen, Denmark
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Old 1st October 2014, 04:21 AM   #17
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Quote:
Originally Posted by hcpower View Post
The Hifi4All thread has been deleted, in respect for Kens work.
I certainly hope that the provider of your upgrade services did not request for you to take that thread down. That would be quite sad.

In response, I would post the link to this old Acurus L10 review on The Audio Critic. If you are a big L10 fan then you have probably already seen it at some point in the past. If you read some of the reviews you will notice that the reviewers take the covers off of all the preamp's and go through them with a fine tooth comb, listing the strength's and weaknesses of the circuits in every one of them.

This is a DIYAUDIO site and I/we were just doing the same. Nobody is trying to take Mr. Ealey's business away or purposely disrespect him. However, when you run a business as an audio professional selling an upgrade service then the quality of your work and the upgrades you perform are open for critiquing, like it or not.

I personally see nothing wrong with displaying the interior of any audio gear upgraded by a "High end audio professional". The display of such upgrades should be a testament to their workmanship and draw in even more customers.

I am glad that you are happy with your upgraded L10 and wish you the best with your system.
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Old 1st October 2014, 08:33 AM   #18
hcpower is offline hcpower  Denmark
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Quote:
Originally Posted by Chamberman View Post
I certainly hope that the provider of your upgrade services did not request for you to take that thread down. That would be quite sad.
Actually the thread was closed by admin on my request. I was more then proud to show the circuit in the forum, although the thread wasn't about it at all. Unfortunately when showing the pics, people from all around Denmark started mailing me for a direct copy of the circuit, and that wasn't my intention when starting the thread at all..

The thread was about the PSU.

thanks.
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Old 10th November 2014, 03:50 AM   #19
Rodrite is offline Rodrite  United States
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Default Ken Easley

Hello
I'm glad I stumbled on this thread, I have an Acurus RL-11 and I emailed ken about how long it would take to do the upgrade and his reply was, "I wouldn't recommend you do the upgrade, you probably won't be happy with the results". I don't know if he was having a bad day or misread the tone of my email because I asked how long it would take? Or was it a disgruntled employee? Whatever the case after reading the thread I guess unless you know what you're doing or getting done, be sure you do your research. I enjoy the Acurus i think it sounds amazing stock. But I enjoy the music in my Jeep with the top down! If my acurus ever " breaks" I'd consider upgrades when repairing. So any upgrade suggestions would be more than welcomed. Maybe 5-10 down the road? Who knows
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Old 11th November 2014, 12:32 AM   #20
ammel68 is offline ammel68  United States
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Quote:
Originally Posted by Rodrite View Post
Hello
I'm glad I stumbled on this thread, I have an Acurus RL-11 and I emailed ken about how long it would take to do the upgrade and his reply was, "I wouldn't recommend you do the upgrade, you probably won't be happy with the results".
At least you got an email reply. That's more than I ever received from ole' Ken.
I sent several emails and never got the first reply. Perhaps he thought I was being a little too "nosey".
At that point, I reached my conclusion about ole' Ken and decided I wouldn't let him ever touch anything of mine. So paying the outrageous price he wants for his "upgrades" was definitely out of the question!

Anyway, I'm really glad Chamberman could shed some light on his "upgrades". If those are indeed some of the things he changes, then these so-called "upgrades" make absolutely NO sense to me, either.
With no coupling caps at the outputs, I would measure the offset at the outputs before connecting it to any power amp.
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