Hardwired LM1875 from ALiexpress

ttan98 · 11:31 AM

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

richb · 12th February 2021, 11:47 AM

"....the human voice is closer and more poisonous"

Reason enough to buy I'd say!

adason · 12th February 2021, 02:25 PM

Maybe due to fake wima caps?

FauxFrench · 12th February 2021, 02:48 PM

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.

chermann · 12th February 2021, 03:06 PM

sorry...but this is just another "idea" to get more money for nothing

FauxFrench · 12th February 2021, 03:18 PM

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.

ttan98 · 10:21 PM

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.

FauxFrench · 12th February 2021, 10:58 PM

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.

ttan98 · 12th February 2021, 11:42 PM

Quote:

Originally Posted by FauxFrench

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.

xrk971 · 09:40 PM

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.

I also made a Pass F5, 2SK2013/2SJ313 Juma edition this way:

12th February 2021, 02:25 PM	#3
adason diyAudio Member Join Date: Nov 2004 Location: Maryland	Maybe due to fake wima caps? __________________ http://edsaudiopages.blogspot.com/ https://waystomakespeakers.blogspot.com/

12th February 2021, 10:19 PM	#7
ttan98 diyAudio Member Join Date: Apr 2006 Location: Melb	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.

13th February 2021, 09:37 PM	#10
xrk971 Got Foam? diyAudio Member Join Date: Oct 2012 Location: Metro DC (Virginia)	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. I also made a Pass F5, 2SK2013/2SJ313 Juma edition this way: __________________ XRKaudio https://www.etsy.com/shop/XRKAudio Last edited by xrk971; 13th February 2021 at 09:40 PM.

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12th February 2021, 11:47 AM	#2
richb diyAudio Member Join Date: Feb 2012 Location: Southampton	"....the human voice is closer and more poisonous" Reason enough to buy I'd say!

12th February 2021, 02:48 PM	#4
FauxFrench diyAudio Member Join Date: Dec 2017 Location: The mountains, calm and quiet.	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.

12th February 2021, 03:06 PM	#5
chermann diyAudio Member Join Date: Jan 2017 Location: Vienna	sorry...but this is just another "idea" to get more money for nothing

12th February 2021, 03:18 PM	#6
FauxFrench diyAudio Member Join Date: Dec 2017 Location: The mountains, calm and quiet.	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.

12th February 2021, 10:58 PM	#8
FauxFrench diyAudio Member Join Date: Dec 2017 Location: The mountains, calm and quiet.	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.