Comments on: Inside Altec Lansing MX5021: Amplifier Mod http://jimmyauw.com/2007/03/15/inside-altec-mx5021/ Fri, 10 Feb 2012 08:21:15 +0000 hourly 1 http://wordpress.org/?v=3.3.1 By: Auw Jimmy http://jimmyauw.com/2007/03/15/inside-altec-mx5021/comment-page-9/#comment-128913 Auw Jimmy Wed, 08 Feb 2012 14:10:25 +0000 http://jimmyauw.com/?p=120#comment-128913 Hi Draco, PCB has no relation with maximum voltage, but you have to check if your circuit (opamp/amp/etc) support 18VDC or not. Thanks. Hi Draco,
PCB has no relation with maximum voltage, but you have to check if your circuit (opamp/amp/etc) support 18VDC or not.
Thanks.

]]> By: Draco http://jimmyauw.com/2007/03/15/inside-altec-mx5021/comment-page-9/#comment-128906 Draco Tue, 07 Feb 2012 11:05:57 +0000 http://jimmyauw.com/?p=120#comment-128906 the terrible sound suddenly just gone. (i've done nothing ) i don't know what causing that. but if trebel max n volume max it occurs again may the pcb is not support for 18v?? maybe i just going for stock 12 v 18v just to boost LM1875 output power. but satelite just overwhelmed the sub THnX jim U really helping me...... the terrible sound suddenly just gone.
(i’ve done nothing )
i don’t know what causing that.
but if trebel max n volume max it occurs again
may the pcb is not support for 18v??
maybe i just going for stock 12 v
18v just to boost LM1875 output power.
but satelite just overwhelmed the sub

THnX jim U really helping me……

]]> By: Auw Jimmy http://jimmyauw.com/2007/03/15/inside-altec-mx5021/comment-page-9/#comment-128902 Auw Jimmy Tue, 07 Feb 2012 04:24:54 +0000 http://jimmyauw.com/?p=120#comment-128902 Hi, Perhaps your circuit got some oscillation. Thanks. Hi,
Perhaps your circuit got some oscillation.
Thanks.

]]> By: Draco http://jimmyauw.com/2007/03/15/inside-altec-mx5021/comment-page-9/#comment-128896 Draco Mon, 06 Feb 2012 10:30:19 +0000 http://jimmyauw.com/?p=120#comment-128896 my opamp is OP270 max voltage 18v my opamp is OP270 max voltage 18v

]]> By: Draco http://jimmyauw.com/2007/03/15/inside-altec-mx5021/comment-page-9/#comment-128895 Draco Mon, 06 Feb 2012 10:29:09 +0000 http://jimmyauw.com/?p=120#comment-128895 i've substitute stock trafo to toroidal with 5a/18v diode also use 6a (2a stock) but satellite sound is terrible. it's sound "ciiiit", when it hit a high treble what caused that?? was the opamp over voltage? i’ve substitute stock trafo to toroidal with 5a/18v
diode also use 6a (2a stock)
but satellite sound is terrible. it’s sound “ciiiit”, when it hit a high treble
what caused that??
was the opamp over voltage?

]]> By: Auw Jimmy http://jimmyauw.com/2007/03/15/inside-altec-mx5021/comment-page-9/#comment-128867 Auw Jimmy Thu, 02 Feb 2012 15:53:14 +0000 http://jimmyauw.com/?p=120#comment-128867 Hi, Both toroidal and EI are good as long well manufactured. Cerafine is also good for power supply. Thanks. Hi,
Both toroidal and EI are good as long well manufactured.
Cerafine is also good for power supply.
Thanks.

]]> By: Draco http://jimmyauw.com/2007/03/15/inside-altec-mx5021/comment-page-9/#comment-128803 Draco Fri, 27 Jan 2012 12:00:44 +0000 http://jimmyauw.com/?p=120#comment-128803 sorry to bother you can you be more specific about difference in sound reproduction between EI trafo n toroidal??? or disadvantages of toroidal trafo compare to EI trafo. if i intend to change caps in power supply will it improve sound a lot? default is yungli, what caps you suggest to replace yungli?? is elna cerafine good for power supply? i've heard OP270 has good mid n a warmer sound. but not in my system. it's still a little too bright. sorry to bother you
can you be more specific about difference in sound reproduction between EI trafo n toroidal???
or disadvantages of toroidal trafo compare to EI trafo.
if i intend to change caps in power supply will it improve sound a lot?
default is yungli, what caps you suggest to replace yungli??
is elna cerafine good for power supply?
i’ve heard OP270 has good mid n a warmer sound. but not in my system. it’s still a little too bright.

]]> By: oci6464 http://jimmyauw.com/2007/03/15/inside-altec-mx5021/comment-page-8/#comment-128741 oci6464 Tue, 24 Jan 2012 15:07:44 +0000 http://jimmyauw.com/?p=120#comment-128741 mas jimmy maaf newbie soal mod speakers,ane ada spekear altec lansing acs45 ne kira2 partnya di ganti yg apa yah? 1 buah 4700uf 25v -> 3 buah 1000uf 16v -> 8 buah 100uf 16v -> op amp KIA6210AH -> op ic TA8248K -> opa KIA358P -> NE572N -> mas jimmy maaf newbie soal mod speakers,ane ada spekear altec lansing acs45 ne kira2 partnya di ganti yg apa yah?
1 buah 4700uf 25v ->
3 buah 1000uf 16v ->
8 buah 100uf 16v ->
op amp KIA6210AH ->
op ic TA8248K ->
opa KIA358P ->
NE572N ->

]]> By: Auw Jimmy http://jimmyauw.com/2007/03/15/inside-altec-mx5021/comment-page-8/#comment-128739 Auw Jimmy Tue, 24 Jan 2012 13:54:36 +0000 http://jimmyauw.com/?p=120#comment-128739 Hi, Any transformer with sufficient rating will do. No need to go with Toroid. Cerafine got warmer sound, instead of Silmic which tends to have transparent type. Thanks. Hi,
Any transformer with sufficient rating will do. No need to go with Toroid.
Cerafine got warmer sound, instead of Silmic which tends to have transparent type.
Thanks.

]]> By: Draco http://jimmyauw.com/2007/03/15/inside-altec-mx5021/comment-page-8/#comment-128736 Draco Tue, 24 Jan 2012 12:09:08 +0000 http://jimmyauw.com/?p=120#comment-128736 ehm, i think i gonna need a new trafo where i can find toroid trafo??? it's quite rare have you compare silmic 2 n cerafine what's the difference in sound production??? ehm,
i think i gonna need a new trafo
where i can find toroid trafo???
it’s quite rare
have you compare silmic 2 n cerafine what’s the difference in sound production???

]]> By: Auw Jimmy http://jimmyauw.com/2007/03/15/inside-altec-mx5021/comment-page-8/#comment-128735 Auw Jimmy Tue, 24 Jan 2012 10:41:58 +0000 http://jimmyauw.com/?p=120#comment-128735 Hi, If not enough power, you can see the sound is slighly lighter, not enough punch, and if you force it, it may damage the speaker. Thanks. Hi,
If not enough power, you can see the sound is slighly lighter, not enough punch, and if you force it, it may damage the speaker.
Thanks.

]]> By: Auw Jimmy http://jimmyauw.com/2007/03/15/inside-altec-mx5021/comment-page-8/#comment-128734 Auw Jimmy Tue, 24 Jan 2012 10:41:13 +0000 http://jimmyauw.com/?p=120#comment-128734 Hi, Mostly sibilant is contributed by the speaker. Then could be emphazised by a lot of factor during the transmission from original signal to the speaker. Upgrade the transformer could achive better sound. Also changing to the Cerafine probably could help. But definitely not easy to start guessing without even hearing what is the sound by myself... Thanks. Hi,
Mostly sibilant is contributed by the speaker. Then could be emphazised by a lot of factor during the transmission from original signal to the speaker.
Upgrade the transformer could achive better sound. Also changing to the Cerafine probably could help.
But definitely not easy to start guessing without even hearing what is the sound by myself…
Thanks.

]]> By: Draco http://jimmyauw.com/2007/03/15/inside-altec-mx5021/comment-page-8/#comment-128732 Draco Tue, 24 Jan 2012 09:17:11 +0000 http://jimmyauw.com/?p=120#comment-128732 what is happen if speaker don't have enough power to powering it self? my friend said, bass will sound boomy n hollow i'm still curious where sibillance came from? is this cause by lack of power to???? or something else??? what is happen if speaker don’t have enough power to powering it self?
my friend said, bass will sound boomy n hollow
i’m still curious where sibillance came from?
is this cause by lack of power to????
or something else???

]]> By: Draco http://jimmyauw.com/2007/03/15/inside-altec-mx5021/comment-page-8/#comment-128730 Draco Tue, 24 Jan 2012 04:39:01 +0000 http://jimmyauw.com/?p=120#comment-128730 all of it supplied by non toroid trafo 1,3a it's lack of power isn't it?? i've changed the opamp to op270 it's sound good, but sibillance still present n still sharp but it's have better separation, detail n sweet mid. also i've change all TDA to LM1875. it's give more power. bass is now more powerful than ever but a little to boomy. sweet treble n mid, but still sibillance n sharp i've try Simbadda CST 6100 satellite to my speaker n it's sibilance too, but better than the DBE SP88 satellite. maybe i could substitute elna silmic caps is cerafine have warmer sound?? or i just need to change trafo with more power??? say 3a 12V CT ? or even toroid trafo??? what is the difference in sound quality between toroid n non toroid with same spec, say 3a 12V CT what caused sibillance??? THnX all of it supplied by non toroid trafo 1,3a
it’s lack of power isn’t it??
i’ve changed the opamp to op270 it’s sound good, but sibillance still present n still sharp
but it’s have better separation, detail n sweet mid. also i’ve change all TDA to LM1875.
it’s give more power.
bass is now more powerful than ever but a little to boomy. sweet treble n mid, but still sibillance n sharp
i’ve try Simbadda CST 6100 satellite to my speaker n it’s sibilance too, but better than the DBE SP88 satellite.
maybe i could substitute elna silmic caps
is cerafine have warmer sound??
or i just need to change trafo with more power???
say 3a 12V CT ?
or even toroid trafo???
what is the difference in sound quality between toroid n non toroid with same spec, say 3a 12V CT
what caused sibillance???
THnX

]]> By: Auw Jimmy http://jimmyauw.com/2007/03/15/inside-altec-mx5021/comment-page-8/#comment-128727 Auw Jimmy Mon, 23 Jan 2012 12:01:34 +0000 http://jimmyauw.com/?p=120#comment-128727 Hi, Maybe you can try Elna Cerafine, instead of Silmic. LM1875 is just fine, as long you have correct voltage and current. The 12VCT/1.3A used to supply one TDA or for all 4 TDAs? Thanks. Hi,
Maybe you can try Elna Cerafine, instead of Silmic.

LM1875 is just fine, as long you have correct voltage and current. The 12VCT/1.3A used to supply one TDA or for all 4 TDAs?

Thanks.

]]> By: Draco http://jimmyauw.com/2007/03/15/inside-altec-mx5021/comment-page-8/#comment-128725 Draco Mon, 23 Jan 2012 01:58:37 +0000 http://jimmyauw.com/?p=120#comment-128725 jrc 4558 replaced by op270 is this bring a lot of improvement in the term of sound quality?? right now my satellite is sibillance n to bright. it's sound to sharp. my speaker is DBE SP88 i've substitute all the caps on control tone by elna silmic2 but have same value, default caps is yungli is this cause by the elna caps???? i've checked the power use TDA2030a if i intend to substitute it to LM1875 is there will be any trouble??? the power use 1,3a CT 12V non toroid Trafo and there are 4 TDA, 2 sub, 2 for each satellite i intend to change all of it to LM1875, are LM1875 bring an improvement to the sound quality compare with the stock TDA???? the satellite use Solen MKP 4,7 400V caps klotz LY215 cable n macrom gold RCA connector. monster stereolink interconnect cable jrc 4558 replaced by op270 is this bring a lot of improvement in the term of sound quality??
right now my satellite is sibillance n to bright.
it’s sound to sharp.
my speaker is DBE SP88
i’ve substitute all the caps on control tone by elna silmic2 but have same value, default caps is yungli
is this cause by the elna caps????
i’ve checked the power use TDA2030a if i intend to substitute it to LM1875 is there will be any trouble???
the power use 1,3a CT 12V non toroid Trafo
and there are 4 TDA, 2 sub, 2 for each satellite i intend to change all of it to LM1875, are LM1875 bring an improvement to the sound quality compare with the stock TDA????
the satellite use Solen MKP 4,7 400V caps
klotz LY215 cable n macrom gold RCA connector.
monster stereolink interconnect cable

]]> By: Fayiz http://jimmyauw.com/2007/03/15/inside-altec-mx5021/comment-page-8/#comment-128590 Fayiz Mon, 09 Jan 2012 14:46:20 +0000 http://jimmyauw.com/?p=120#comment-128590 karena bunyi kresek2 terus mengganggu, akhir nya saya putuskan mengganti kapasitor yang dekat dengan TDA 7265 dengan Kapasitor merk rubycon (nggak tau asli atau palsu karena saya memang benar2 buta dengan parts elektronik, cuma bisa nyolder doang)trus 10.000u 50v Elna Onkyo for HiFi, 3.300u 50v (merk nggak jelas) dan 1.000u 50v (merk nggak jelas)...setelah nyobain hidup sekitar 4 jam an bunyi kresek2 nya nggak ada lagi...Thanks for your guide...tetapi untuk Op-amp nya saya belum ganti karena nggak ada stok 2134pa nya...klu cuma sampai disini modding nya kira2 apa nilai tambah nya di banding sebelum di modding...kecuali bunyi kresek2 nya hilang...? karena bunyi kresek2 terus mengganggu, akhir nya saya putuskan mengganti kapasitor yang dekat dengan TDA 7265 dengan Kapasitor merk rubycon (nggak tau asli atau palsu karena saya memang benar2 buta dengan parts elektronik, cuma bisa nyolder doang)trus 10.000u 50v Elna Onkyo for HiFi, 3.300u 50v (merk nggak jelas) dan 1.000u 50v (merk nggak jelas)…setelah nyobain hidup sekitar 4 jam an bunyi kresek2 nya nggak ada lagi…Thanks for your guide…tetapi untuk Op-amp nya saya belum ganti karena nggak ada stok 2134pa nya…klu cuma sampai disini modding nya kira2 apa nilai tambah nya di banding sebelum di modding…kecuali bunyi kresek2 nya hilang…?

]]> By: Auw Jimmy http://jimmyauw.com/2007/03/15/inside-altec-mx5021/comment-page-8/#comment-128581 Auw Jimmy Fri, 06 Jan 2012 14:59:14 +0000 http://jimmyauw.com/?p=120#comment-128581 Waduh kalo gitu mesti dicek semua Pak... enggak bisa 'telepati' gini he he he... Waduh kalo gitu mesti dicek semua Pak… enggak bisa ‘telepati’ gini he he he…

]]> By: Fayiz http://jimmyauw.com/2007/03/15/inside-altec-mx5021/comment-page-8/#comment-128579 Fayiz Fri, 06 Jan 2012 06:55:22 +0000 http://jimmyauw.com/?p=120#comment-128579 TDA 7265 ya Om Jimmy...tapi ada di post no.372, dia sdh ganti TDA 7265 dan kapasitor nya, tetapi problem nya belum selesai...kmrn coba ganti 7809, tapi klu sdh panas dia bunyi lagi... TQ TDA 7265 ya Om Jimmy…tapi ada di post no.372, dia sdh ganti TDA 7265 dan kapasitor nya, tetapi problem nya belum selesai…kmrn coba ganti 7809, tapi klu sdh panas dia bunyi lagi…
TQ

]]> By: Auw Jimmy http://jimmyauw.com/2007/03/15/inside-altec-mx5021/comment-page-8/#comment-128573 Auw Jimmy Thu, 05 Jan 2012 15:45:25 +0000 http://jimmyauw.com/?p=120#comment-128573 Hi, Could be from your TDA chip. Thanks. Hi,
Could be from your TDA chip.
Thanks.

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