opa 627bp in MHZS cd33

Windwss,

HDAM circuit here:

Red circle area is MUTE, you are no need to do that part.

Wish you complete it soon.

Any problem, please let me know, I have PCB !!!

KK.Ho @ HK

Dear KK,

Only 1 piece TL072 (DUAL channel), got 2 cap(coupling) beside it (2x0.47uF/63v).
thank pls send me the info for discrete soulution!! :  

Windwss,

Ask you one question.

How many TL072 in your application ?

If one IC for both channel, I suggest discrete solution.
Discrete HDAM FET driver, will send the pic to you later.

Un-believeable sound

KK




[quote:af18ab7c35="WINDWSS"]Kk sir,
Thanks for remind me.....

It is rail to rail +12.38 &-12.38, mean total diffrences 24.77V at V+ when refer to V- .

so it is +12.38,0,-12.38-->total 24.77V difference.

Since i put probe at point V+ (pin 8) & point V- (pin 4)

Dear KK sir,

from your experience, which OPA is suit to replace the TL072 in this 8000A.
(i wish to increase slightly clear, natural & stronger but good control of bass, warmer vocal in 8000A)
In my mind got 3 choice --> 1) AD 8066 (since it's bass better than opa2132/34   2)OPA 2132/34  3) AD 8620 (i worry this too agresive)

i know most people will suggest opa627 : ) but this it is expensive in malaysia at least 2x-3x the price as the item 1,2,3 above. And main issue is taht i don't know how to build the circuit to pair up the opa627 with coupling cap : (


ahrader,
had check, octave sell AD8066 at rm85 (include the panel, BG cap), farnell sell TI opa2132 (dip) at ~rm25.
TL071 is single channel, u may just get a opa 627 (dip) ....since it can support +/-15v (typ)-->total=30v[/quote]

Kk sir,
Thanks for remind me.....

It is rail to rail +12.38 &-12.38, mean total diffrences 24.77V at V+ when refer to V- .

so it is +12.38,0,-12.38-->total 24.77V difference.

Since i put probe at point V+ (pin 8) & point V- (pin 4)

Dear KK sir,

from your experience, which OPA is suit to replace the TL072 in this 8000A.
(i wish to increase slightly clear, natural & stronger but good control of bass, warmer vocal in 8000A)
In my mind got 3 choice --> 1) AD 8066 (since it's bass better than opa2132/34   2)OPA 2132/34  3) AD 8620 (i worry this too agresive)

i know most people will suggest opa627 : ) but this it is expensive in malaysia at least 2x-3x the price as the item 1,2,3 above. And main issue is taht i don't know how to build the circuit to pair up the opa627 with coupling cap : (


ahrader,
had check, octave sell AD8066 at rm85 (include the panel, BG cap), farnell sell TI opa2132 (dip) at ~rm25.
TL071 is single channel, u may just get a opa 627 (dip) ....since it can support +/-15v (typ)-->total=30v

Windwss,

Respect to GND measurement or rail to rail ?

If respect to GND measurement :
+24 at Pin 8
0
-24 at Pin 4

If rail to rail
+12 at Pin 8
0
-12 at Pin 4

Meaning is dif.
There are many new DIYer beginner here, so please confirm.

KK.Ho

aharder,

your 8000c using TL071CP not TL072CP ah??

i had measure the voltage between V+ & V- in my 8000A opa(tl072cp) it is 24.77V, it is safer if use opa which can support ~25V.

I most probably will try a cheap OPA2132.

dear all,

did anybody know the best replacement for TL071CP op-amp?

Hi all,

thanks for your concern, actually i enjoy the music every night.   just that stop for MOD(will start back after CNY). Below are some PIC, the last thing i change is the MUNDORF Silver Oil Cap. sound clear n bass increase, compare to MUNDORF TinFoil. enjoy the MUSIC! :wink:





Thanks for sharing!

VIEWER,

Superwhite currently busy in work and he temporary stop modification. he already chae a lot thing in his CD33 except the clock. For his 8000S he had change all e-cap to BG..... i think his next step is to look for a better speaker.....

now i'm waiting to listen to my friend's clone proAc 1sc during coming Chiness New year and als waiting parts from him...

By the way, has u try the AD8610 / AD825 as OPA? any comment?

hi superwhite,

Long time no hearing from you. any news of your modification on the hifi system ??????????


Thanks for sharing.

AHARDER,

HK Hififever only got the 4pole type jensen 10000uF/63 at this moment. Theoritically it seems better than 2pole, but practically it depend....
but make sure u know how to connect the 4 pole type..

u if want must inform by today if u 12 get in this cny. if not wait for another time when my friend go hk again.

since your 8000C got plenty of space , why not try KK sir's suggestion use 10pcs 1000uF parallel or 5pc 2200uf-->must better result!

windwss

i also plan to change it in my audiolab 8000C. any other way to get this jensen?

Shifu Viewer,

Need your advice again....

Do u have any idea a better replacement for ENA BLACK NEGATIVE 10000UF reservoir?
The jansen is out of stock.

The easier obtain cap is as below:
1)BC component 2222050(long life)
2)BHC AEROVOX ALT22 (long life)

which 1 you think is better?

i prefer a reservoir which have warm & soft sound & less noise....

Viewer,

U seems had try a lot of cap or component.

Later if got time can you share with use your experience in each type of brand&model/component which you had try before, or maybe u can just write a a word format from time to time when you are free.....

Since you got so much experience in modify equipment, have you DIY the whole set of equipment before?

hi windwss,

BC cap is warm sound in mid range.
ERO cap is clear sound in high notes.


Thanks.

Thank you viewer, initially i thought it is different model since i only saw green mkp1845 and never saw blue 1845 here.....

by the way have u use the BC Component blue colour film&foil cap before (2222460-464 series)?? how's its performance compare to mkt 1813?

hi windwss,

It should be ero mkp1845.
ero mkp 1845 in blue colour is the higher grade than greedn colour on high notes.


Thanks.

Viewer,

I know u had use many time the ERO blue colour axial type MKP cap, may i know what ther full model no.? last time you write as MKP 1852 but it seems not in the manufacturer list? is it 1846?

as i know mkp1845 is the green colour(axial lead)

hi windwss,

You can follow this web site:
http://www.diyeden.com/Index.html
You can buy it from this shop:
http://vocativeaudio.com/

Thanks.

ozrayyau,

Your photo is after change to blackgate cap right?

what's the original e-cap?
where you buy in HK and how much is it?
where can i get more info on this MD 10, for example the chip use and so on....

thank you.

here it is,

ozrayyau,

可否贴些MD10内部的照片来看看？

[quote:3d26c7249c="kin111kin"]其實有無作大,見佢入面的料好雞,如果摩佢,咁萬幾元的DAC都唔夠佢輝,有無咁勁呀!真係要聽o下,早排好似做緊特價,唔知完未?[/quote]
我有個朋友,佢架68改了荷蘭*吹喇叭*6DJ8,Hovland output Caps,Black Gate 水塘同機內接線。我攞咗我架未改MD10去比佢試,點知比佢扣留,然後仲比返錢我 :x ,佢話好多地方部68都輸,除咗音樂感,過幾日陳生改好架MD10,只改水塘,再比佢試,呢次佢比返３樣野我,之前架MD10(佢要咗新嗰架) / 改Caps錢 / 同架68,叫我攪掂(賣)佢 : 依家68一無是處 8)
我相信名廠依然好好聲,不過比多5/6陪錢,得10%左右(可能更小 :wink: )好聲過MD10,我諗你識點做 :idea:

其實有無作大,見佢入面的料好雞,如果摩佢,咁萬幾元的DAC都唔夠佢輝,有無咁勁呀!真係要聽o下,早排好似做緊特價,唔知完未?

[quote:52b42c4bf2="kin111kin"]老爺機,金仔E202,飛記cd950(OPA627BP*4,換電容和1ppm clock),AR 11
電腦用安橋聲卡>麗特DAC-AM(OPA627BP*+4OPA627AM*4,換電容和1ppm clock)>NAD3020E>CHANIO(換分音電容,箱內接線)
雖然全部老爺cheap機,但都好滿意!
聽講隻Musiland MD10好勁,CD66勁摩$5000元後都輸條街,而且還未摩改,唔知LITE 72(一聽難忘版)同佢有無得輝?我用緊LITE DAC AM,同PHILIPS CD950只能打成平手[/quote]
大改68都輸比MD10,Lite AM?算啦 8)

在HIFI，很多老机分分钟比新机好(尤其是一些硬体的用料)， 而小磨之后表现更好。。
只是好又便宜的旧机真是可遇不可求！！
在马来西亚要找好二手机更难！

老爺機,金仔E202,飛記cd950(OPA627BP*4,換電容和1ppm clock),AR 11
電腦用安橋聲卡>麗特DAC-AM(OPA627BP*+4OPA627AM*4,換電容和1ppm clock)>NAD3020E>CHANIO(換分音電容,箱內接線)
雖然全部老爺cheap機,但都好滿意!
聽講隻Musiland MD10好勁,CD66勁摩$5000元後都輸條街,而且還未摩改,唔知LITE 72(一聽難忘版)同佢有無得輝?我用緊LITE DAC AM,同PHILIPS CD950只能打成平手

kin,

u r right, so arharder use 2 pieces 797 mount on a board with adapter.

So what system are you using now?

AD797好似係單運放而OPA2604是雙運放

Aharder,

When it can switch on, is the display ok?

check all the connection (i found this type of china made board not reliable, the most u dissemble n assemble than more problem...), check your cdp ribbon cable connection and use multimeter to check the ribbon cable. There is 1 time i found 3 cable insdie the ribbon cable break but can't observer visually, it is a haie line break... so some time can play sometime can't....

dear all,
:cry:  :cry:  :cry:  :cry:  :cry:  :cry:  :cry:  :cry:  :cry:
Once again my cdp having problem after I changed back BB2604 op-amp, yesterday I was tried to install the origanal op-amp (BB2604) and the cdp totally can't be switch on, the tray was ejected but there is no display from the screen. At last I install the AD797 after I tried for a few times, the cdp was not so reliable, first few times it's also given problem until this morning I try, it's still not perform as normal. The problem now is sometimes it's working sometimes it's can't be switch on, I have to on and off for few time only it's able to be switch on.

I have no idea which path of the cdp is giving problem since I used back the BB2604 it's also can't be switch on.  :?:  :?:  :?:  :?:  :?:  :?:  :?:  :?:  :?:  :?:  :?:  :?:  :?:

viewer,

ok thanks, i saw there is blank board sell in china www.lite8.com so i thought HK will sell it too....

hi windwss,

In my knowledge, no blank DAC-ah in HK for sell.
It only have full solder all compents with 8 pics TDA1543 in pbc for sell at this web site:

http://eshop.diyclub.biz/index.php?cPath=23_135
http://www.diykits.com.hk/index.html
Thanks.

viewer,

I understand that Lite dac-AH also got blank board to sell.

May i know:
1) is Hk have this type of blank DAC-AC board sell?
2) Is this blank Dac-ah contain the 8pcs TDA Chip on board or it is totally blank/empty?

I found BC/philips 030/031series is also cheap and nice e-cap, i prefer this than the panasonic FC.

hi kin111kin,

Normally you are right, but try more learn more, this is diy's fun.

do you agreed.

果位0.1uf電容好似用0黎將2位單運放轉雙運放線路時可能會產生雜訊而把它消除,如將它改成1uf就會cutopa627的特點(華麗的高頻),失去它的特性,唔知我講得
o岩唔o岩?

Hi windwss,

can replace by opa2604 and bb627.
1uf is more bass.

thanks.

thank you viewer,

than BG 0.47nh hi q should suit me... hovland music cap is quite expensive...

do u think TL072cp can be replace by opa 627 or opa 2604?
the TL072 is the opa in my audiolab amp, and the 2 coupling cap is 0.47uF/63v, so if i change it to larger uF bass shall inrease right? thinking change it to 1uF so taht bass extension more....

hi windwss,

2 coupling cap, u r using 0.1uF right? some are using BG0.47uF NH hi Q, which value Do u rcomend for 627bp? So using BG or other film foil cap better?

if use more value the bass will be stronge.
BG is very ok la!!!!!!!!!!!!
film foil cap must use high grade, then the cost will high than BG.
speed is fast than BG.
I suggect film foil cap. I am using Muscial Cap 0.1uf/400v now very good.

thanks.

viewer,

just to check with u, normally the opa 627 will use together with 2 coupling cap, u r using 0.1uF right? some are using BG0.47uF NH hi Q, which value Do u rcomend for 627bp? So using BG or other film foil cap better?

kin,
pls refer topic by dynamicdog.... if not mistaken he said for hifi using coxial is better than optical, for AV opctical is better...

請問ah同am比較那個好?因我的am換了bg fk電容,4X627am+4X627bm和1ppm clock,只能少勝摩改電容,獨立電源千和改了1ppm clock的philips cd 950,到底還有什麼地方可以改善?(我用光纖,因我怕用同軸會有音色改變,影響比試結果)請指點!

hi windwss,

red colour pcb and green pcb are the same just the color difference.

green colour in china, red colour for export goods.

thanks.

hi windwss,

BB 627 ap's sound is clear than 627BP but bass control is BB627BP better than BB627AP. this is my comment.

in HK BB627ap costs HK$50 each
         BB627bp costs HK$80 each
both 2nd hand goods.
you can buy it at this web site:

http://www.diykits.com.hk

sometime they have brand new DAC-ah around $700
                              2nd hand DAV-ah  around $500

If need i will send the photo to you to modifity it.


Thanks.

if he buy it i will help him to modify...but need your advice on modify output circuit.

change cap is quite easy.

by the way is 627 BP better than 627AP?

hi windwss,

you can find it at this web site in hk:
http://www.review33.com/avforum/

My DAC-ah is heavy modified by me, if your friend new hand on diy, I suggest a little bit to modifity is ok la !!!!!!!!!!!!!!!!
costs HK$350
re-correct the curiscit of outup. $10
changed some e-cap and outup cap $200
changed opm to BB627ap $100

thanks,.

[quote:6a92344ebb="viewer"]hi windwss,

I suggest buy it from 2bd hand market in hk , price around $400.00
after  modifity it. the sound is = $8k dac.

Thanks.[/quote]

In HK which place easy to find 2nd hand Lite DAC AH?

if <hk500 i will ask him to get 1 for me too!

by the way i had saw many type lite dac-ah some are red board some are green board like you, which board is good/not easily spoil during soldering?

thank you shifu..... i had saw your modified DAC picture... really don't know how u can squeeze so many big size cap into the small box!

hi windwss,

I suggest buy it from 2bd hand market in hk , price around $400.00
after  modifity it. the sound is = $8k dac.

Thanks.

viewer,

My friend is thinking to buy a LITE DAC AH.

Do u know whether buy a new 1? and where to buy a 2nd hand in HK or china?

dear all,
my cdp look like no problem already, i had tested it for 18 hours yesterday and it's didn't give any problem like before to me. so i guess it's just a minor run in problem.

i had shared some of my view about ad797 before based at lower volume cause i test it at midnight. yesterday i test it again evening and i turn the volume at "normal listening dB". may be the ad797 had been burned-in for one day, the result is much much much more better. bass is more natural it's not so soft but also not so hard, just nice to me at my system. the detail od the high frequency is clear and better positioning. but i really like its vocal, vocal really natural and give me the high end system and live feel. finally is the distortion of this ad797 is extremely low.

thanks for your helping and sharing your knowlegde with me.