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Hardwired LM1875 from ALiexpress
Hardwired LM1875 from ALiexpress
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Old 12th February 2021, 11:21 AM   #1
ttan98 is offline ttan98  Australia
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Default Hardwired LM1875 from ALiexpress

Hi,

I wonder anyone has tried this Hardwired version of LM1875 from Aliexpress image below. Any other comments welcomed. The link is here:

LM1875 scaffolding power amplifier board, HIFI2.0 power amplifier, power: 30w+30w input voltage: dual AC transformer 9 18V|Transformers| - AliExpress
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File Type: jpg LM1875Mk1.jpg (489.3 KB, 338 views)

Last edited by ttan98; 12th February 2021 at 11:31 AM.
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Old 12th February 2021, 11:47 AM   #2
richb is offline richb  United Kingdom
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"....the human voice is closer and more poisonous"

Reason enough to buy I'd say!
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Old 12th February 2021, 02:25 PM   #3
adason is offline adason  United States
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Maybe due to fake wima caps?
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Old 12th February 2021, 02:48 PM   #4
FauxFrench is offline FauxFrench  France
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It has certain unusual aesthetics. Apart from that, I doubt it sounds better than any other good LM1875 implementation. Be aware that many LM1875 from out east are in fact "fake" and that is more important.
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Old 12th February 2021, 03:06 PM   #5
chermann is offline chermann  Austria
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sorry...but this is just another "idea" to get more money for nothing
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Old 12th February 2021, 03:18 PM   #6
FauxFrench is offline FauxFrench  France
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Hi Chris, Good to hear that you are not buried under snow.
Yes and no, aesthetics are something that is a part of HIFI-gear. A pleasure from just looking at it. Technically I fully agree with you.
If you have to sell it on "the human voice is closer and more poisonous" it means that you won't notice unless you are told.
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Old 12th February 2021, 10:19 PM   #7
ttan98 is offline ttan98  Australia
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Hi,

I'll make the following comments to answer most of yours above:

a. Currently I don't own an LM1875 and I heard from some users it sounded very good(in mids and high freq. spectrum) compared to an LM3886 which I do own.

b. The hardwiring seems attractive to me, in case it does not sound better than my LM3886 I can change(easier since it is hardwired) components such as LM1875, capacitors and lastly replace with better resistors. Besides the price is pretty reasonable. Just slap an enclosure and transformer on it, it is good to go, very easy. And I get a high quality amp.

c. I am using this amp to drive the mid and tweeter in a bi-amp configuration.

Thanks, everyone.

Last edited by ttan98; 12th February 2021 at 10:21 PM. Reason: make it clearer.
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Old 12th February 2021, 10:58 PM   #8
FauxFrench is offline FauxFrench  France
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OK, if you feel that it is easier to change components with this layout. Getting to the LM1875 ICs seems difficult to me.
Genuine LM1875 are very well playing ICs. Strange that is is made with carbon film resistors.
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Old 12th February 2021, 11:42 PM   #9
ttan98 is offline ttan98  Australia
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Quote:
Originally Posted by FauxFrench View Post
OK, if you feel that it is easier to change components with this layout. Getting to the LM1875 ICs seems difficult to me.
Genuine LM1875 are very well playing ICs. Strange that is is made with carbon film resistors.
desoldering LM1875 from PCB is more difficult if you don't have proper tools, also from another seller he offers Dale resistors instead, esp in feedback resistors are crucial.
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Old 13th February 2021, 09:37 PM   #10
xrk971 is offline xrk971  United States
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Hardwired LM1875 from ALiexpress
I built a Pass ACA Class A amp this way. It was a lot of fun. I still use it in my office and it makes a great conversation piece. I would just make one rather than buy one. That’s where the fun is. And if you make one, make a classic like a Pass Class A or a JLH. Chip amps should be on PCBs.

Click the image to open in full size.

I also made a Pass F5, 2SK2013/2SJ313 Juma edition this way:
Click the image to open in full size.
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Last edited by xrk971; 13th February 2021 at 09:40 PM.
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