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Old 26th May 2015, 05:43 PM   #1
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Default Chinese made Kit solid state Amplifiers on Ebay

Hi folks

Just curious has anyone already built any of these kits.
I note their is already a Naim discussion on the site but I was more interested in the L20SE type.
link to finished version here Assembled L20SE Power amplifier board with A1943 C5200 (include 2 channel boards | eBay

I do have previous experience building and modifying equipment and would like to use some of the many vishay bulk foil resistors etc I have left unused.Same with Silmic capacitors. Im not sure I want to try building the Honey badger though it would be a challenge.
Any comments re the design would be helpful.
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Old 26th May 2015, 06:08 PM   #2
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Is there a circuit diagram available?
Any measuring results?
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Old 26th May 2015, 06:22 PM   #3
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Havent found one yet but most of their designs show this generic type circuit
Not sure if I would trust measured results or their significance
Improved MX50 SE Power amplifier assembled board Dual 2.0 channel 100W+100W HIFI | eBay

note item shown on original circuit board are same values ie resistors 68r etc and cap s 105 103 & 101 etc
Neither board uses bypass the larger 100mf caps (easily done)

Last edited by raffajaffa; 26th May 2015 at 06:37 PM.
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Old 26th May 2015, 06:57 PM   #4
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Default another similair

L12-2 Stereo Audio CLASS AB Power Post-Amplifier Board DIY kit dual 2.0 channel | eBay
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Old 27th May 2015, 12:04 AM   #5
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Location: Coffs Harbour
I think you'll find threads for just about any audio kit here.. Some popular ones get several threads.
All 3 you posted; L20, MX50 and L12-2 certainly have threads.

Just use the search button to search this forum or simply Google for the quite prominent DIYaudio threads listed for these LJM designed kits. The designer is a member (ljm_ljm) here and usually starts his own thread to introduce the models and start discussion.
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Old 27th May 2015, 07:49 AM   #6
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Default thanks for that Ian

I had done a few searches but failed to find those links,
Having now spent enough time reading them I have come to conclusion
it would be worth Risking either an assembled version of L20 Ver? or L25 with the
op amp gain stage.The latter almost identical to the Dr White amp I made many years ago which has sadly been damaged in a house movee and which I am now unable to repair.
It also caused a damaged tweeter now repaired .
I was left with one good amp and one good trafo 220watt with ac 38v outs.
Plus 40k Mf or more in quality caps.

Both choices or any other suggestion give me the option of another trafo or a larger replacement.Also chance of lots of swaps of my beloved Vishay resistors etc.They really do work for me.

Just need advice as to which to pick as I need to order today from China as I am away for two weeks.Though I could put off purchase for a few days and try from Croatia or wherever I will be travelling.
Current loan of a commercial amp is driving me nuts.
Ive even looked at the m50s but my long ago impression of Musical fidelity amps was musical but flat.
I have sufficient heat sinking for a battleship but I always preferred the Whitenoise amp very low bias and luke warm.Seemed more dynamic to me.
Thanks for any suggestions.Great progress so far.
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Old 27th May 2015, 10:07 PM   #7
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In case you have not seen this, L20 and L25 also, are discussed in this interesting thread: L20 V8
Post in any thread if you want to discuss any issues - the members who posted may still be reading and able to reply.
Note that there is also L25D which is actually class D and there is at least a short thread in Class D forum here.
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Old 28th May 2015, 06:50 AM   #8
Calvin is offline Calvin  Germany
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type "L12-2" in the search field and click the third hit

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