opa 627bp in MHZS cd33

ozrayyau,

可否贴些MD10内部的照片来看看？

here it is,

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.

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.

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,

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

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


Thanks.

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?

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....

windwss

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

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!

hi superwhite,

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


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 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!

dear all,

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

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.

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

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,

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]

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,

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

WindWSS,

One more, Marantz PM17 amplifier with HDAM buffer

KK

Hi everyone,

Last week I did a comparison with a Arcam CD92. My sound was just as transparant and clear. His was a bit warmer. The differences were so small I was glad I paid a third of his price.

Yesterday a comparison with a modified Pioneer DP-S901. this one I clearly won. More clarity, better placement of the instruments, more high. I think because of the tubes.

A question to WindWWS:

You stated that eclipse pioneer tubes were the best for an acceptable price. Can you tell me where to  find them?

[quote:98beba39ba="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]

Hi kin hing

as I remember the chip use at Onkyo sound card is C-media, its sound quality is crap, and its digital output is a joke, full of jitter, try change a better one sound card and you will have great improvement

windwss,

TL071CP is from my 8000P power amp. there are two ICs which located one in each mono circuit, total have two ICs. if OPA627 can be used then i might probally change to it.

[quote:e177de385f="h3d"]Hi everyone,

Last week I did a comparison with a Arcam CD92. My sound was just as transparant and clear. His was a bit warmer. The differences were so small I was glad I paid a third of his price.

Yesterday a comparison with a modified Pioneer DP-S901. this one I clearly won. More clarity, better placement of the instruments, more high. I think because of the tubes.

A question to WindWWS:

You stated that eclipse pioneer tubes were the best for an acceptable price. Can you tell me where to  find them?[/quote]

H3D,
I purchase it from USA, i actually intended to purchase again but unfortunately the supplier reply me today that they no longer have the stock.

[quote:2899a3ea8e="Abhader08"]windwss,

TL071CP is from my 8000P power amp. there are two ICs which located one in each mono circuit, total have two ICs. if OPA627 can be used then i might probally change to it.[/quote]

If that's the case most probably u can use the 627. just test the voltage in your TL071.

the 627 is +/18v = 36v(rail to rail) if not mistaken.

last weekend i had replace the balck negative(resevoir) of 8000A with Jensen in my friend's amp. It is fantastic... sweet , warm vocal with decend detail.....the improvement of vocal is much more than using WE396 in CDP.....

Hi Windwws

Do you know if there is a big difference between the Bendix 2C51 and the 6385 type?

H3d

h3d,

Sorry since never use the 6385 so can't give comment.
Only know the price is a large difference!!!! ~20x different in cost.
And the sound cannot be 20x better : )

i undersatnd u have 6385 then u just spend <USD 10/pc to get the bendix then make comparation to share with us : )

i personally prefer eclipse pioneer than bedix even they construct in the similar way....

H3D,

Fyi, when i start modification i had set the target to use only cheap &nice part, thus i don't have much idea on expensive part......

Hi Guys,

I bought an MHZS CD33 a few days ago and came across this excellent thread when doing a Google search. I wasn't too happy with the sound of the unit in stock form finding it rather "hazy" and vague sounding. I have started modding it and so far have replaced all of the grotty 1N4007 diodes with ultrafast UF4007 types..... whilst I was under the bonnet I replaced some of the caps with Panasonic FC / FM types and will eventually get round to fitting Panasonic FM throughout the unit.

Popped in an OPA2107 and fired her up.... you know what? chalk and cheese, the improvement is VAST with the sound now being extremely open, spacious and with absolutely subterranean bass... astonishing improvement (not a difference but a marked improvement) I've got a feeling the stash of 1N4007 were adding a bit of grunge to the sound and the OPA2604 probably not the optimum chip for the job.

I can't wait to hear this puppy with half decent output valves, hardwired output connections, Ultrafast diodes in the PSU section, more capacitance, damping... etc. etc. etc. This is a true tweakers dream and @ £180 (or cheaper) an absolute bargain! What price can you buy a CD33 for in China?

One helluva CD player for the money though and one I know I'm going to have a lot of fun with, not only can you opamp roll to tailor the sound to your own ears you can also valve roll.... PCB's are quite easily removed from the chassis too (a few screws) so you can whip either of the PCBs out in a couple of minutes and go to work on them should you want to go further than simply opamp / valve rolling... I'm going to have with this puppy  

Other opamps I'm going to try are AD-843 (on brown dogs) AD-744 class A biased (on Brown Dogs) OPA602 (on Brown Dogs) AD-797 (on Brown Dogs) AD-8620, AD-823, AD826, OPA2227, OPA2228 and my current favourite audio chip the LM4562 (superb audio chip!)

I'll visit this thread from time to time and will post pictures..... great forum you guys have  8)

All the best.

Mike.

hi mike,

nice to hera from your sharing on modification.

By the way how much better the opa2107 compare to opa2132? How about comparison with opa627Ap? just a bit supprise the opa627 is not in your future testing list, is there any special reason?

AD797 seems not as good as opa627 in cd33 (my friend's comment after using it)

By the way, it seems that a lot of people like to use panasonic FC, but i personally feel that it is too soft n bass a bit loose, can improve a bit at high frequency when bypass with ROE mkp/mkt i prefer to use BC(Formerly philips) e-cap : )

kindly share with us after your testing on various opa and other modification. Thank you!

SS

[quote:780bfb31ef="WINDWSS"]hi mike,

nice to hera from your sharing on modification.

By the way how much better the opa2107 compare to opa2132? How about comparison with opa627Ap? just a bit supprise the opa627 is not in your future testing list, is there any special reason?

AD797 seems not as good as opa627 in cd33 (my friend's comment after using it)

By the way, it seems that a lot of people like to use panasonic FC, but i personally feel that it is too soft n bass a bit loose, can improve a bit at high frequency when bypass with ROE mkp/mkt i prefer to use BC(Formerly philips) e-cap : )

kindly share with us after your testing on various opa and other modification. Thank you!

SS[/quote]

Hi WINDWSS,

2107 has a very similar sonic signature to the OPA627 and also has the advantage of being a dual channel chip (dil8) It is slightly less chocolaty sounding than the 627 and I have loads of 2107 so seems logical I use them  

This KSS-213Q pickup concerns me a bit, it says "SONY" on it but I know Sony don't make such a pickup. Also, most of the capacitors used look like fakes to me and the so called "OPA2604" also looked like a fake. Is this quite common with some Chinese equipment? I have also read that the Chinese made KSS-213Q can be pretty unreliable (either last quite long or stop working pretty fast) is there any drop in replacement that can be used? It certainly looks like quite a flimsy pickup to me.

Again, the reason I use Panasonic FM is because I have hundreds of them, I also like the sound of them which is why I use them in all my Musical Fidelity Mods http://www.rock-grotto.co.uk/xcanpropage.htm members of my forum also seem to like them http://rockgrotto.proboards39.com/index.cgi  I have a few ELNA cerafine I will fit in strategic places in the CD-33 but really don't want to spend too much time on it to find the laser breaks down after a short period.... any info you have on the KSS-213Q would be most welcome.

All the best.

Mike.

Hi, mike,

So far in the market in malaysia, for KSS-213C &213Q i only can get the china made product!
last several month i just just replace the cd pick-up... anyway for kss-213Q use in cd-33 so far 2 of my friends who use it don't have problem yet. So good luck to u as well!

u r right, there r a lot fake product from china and sometimes it is hard to know it from the packing. As we all know they are a lot of oversea brand have their factory in china, thus even for panasonic FC cap u can see diifferent type of packing/construction of the lead. sanyo os-con in china product is with white print but the same cap sell in farnel is in gold print work (the outer plastic cover quality look better).

Hi everyone,

I'm new to this site so please forgive me if this is a poor post.

I've looked through this great thread a few times and I'm looking to upgrade my CD33....

AD823 and OPA627 ( plus browndog ) on order and looking for some WE396As.

Its the Capacitor bit thats not so easy. I have a few questions and would be most gratefull if anyone can help :-

* There seem to be 5 that are being replaced ..the two power - one tube and two uptput. Are these the best to start with ?

* They are 0.22uf and 630v other than the tube ( 0.47uf )...do I have to replace with these values or can I use higher uf figures and voltages ?

* Will MCap Supremes/silver/Jensens etc give much noticable improvement over say MCap ZNs ?

* Anyone know a good online source for these CAPs in the UK or has cheap postage to the UK ?

Sorry for the long post folks, hope you can help.

By the way I agree this is a cracking unit even in base form...much better soundstage detail and base than my Zhaulo 2.5 !

many thanks everyone

newfan,

For this cd33, i will suggest little mod is enough, try don't touch the e-cap, since the PCB is not s reliable, it may give u a lot hectic. My friend and i is suffering a lot.

Recomended minor mod:
1) change tube
2) change OPA - 627 is quite suit cd33
3) change the 0.22uf/630v cap at power supply & near the tube.
4) If really wish to change e-cap then change the 100uf/100v & 100uf/160v to better cap like blackgate, i think that will do.

Mcap silver obviously better than mcap zn. Mcap silver when compare to jensen Cu in oil/ audionote cu in oil is different type of sound. If u like vocal then jensen/audio note will be more suitable.

WINDWSS, newfan,

Remember check your MHZ-33/66 have no bug (waveform distortion) before starting your mod.

KK.Ho

Hello,

There is something I don't understand. What is the meaning of OPA627 (plus BrownDog)? I know what a OPA627 is .. but can anyone tell me what is (plus BrownDog)?

Many thanks

Hi,

I purchased a CD 33 a month ago and had been listening to it since. I just use a Pioneer AV Receiver 1016V-s to drive a pair of DIY ProAc speakers.

Last week, I got a "matched" pair of WE 396a (which cost around HK$ 600) and installed them into the player.

The vocal gives a very significant improvement over the original tubes. I also asked my wife to sit down and as an amatuer, she agreed that the WE tubes do give a big difference!

I am glad that there are so many of you sharing your DIY / Modification here. I am now going for the OPAMPS. Will see how signficant they are.

hi alfcat,

go ahead to change opa627 am (metal case) you will found many detail from the sound before. and stronge bass.

because i test the some IC before as follow:

NE55345.
AD797 METAL CASE
OPA2228
OPA 827
DY2000
OPA 2111
OPA 2134
OPA134
OPA627BP AND
OPA627AP

OPA627AM IS TYHE BEST IN MY FEELING.
thank for sharing.

How about HA5112 from Harris ?

hi kk sir,

i have not HA5112 from Harris, so no comment on it.

where can buy and how much ????

thanks.

Hello KK Sir,

How do I test the wave distortion? I think you mentioned it once somewhere along the thread but I can't locate it now. Please advise. Many thanks.

Hello Viewer,

Thanks for your information. I can get hold of 2227, 2228, 2107. For the 627, I only have the AP one but wasn't able to get the AM one. Where did you get it and how much?

Hi alfcat,

You can buy it in HK at the following shop:
it only have 2nd hand, so price is cheap.

http://www.diykits.com.hk/
http://vocativeaudio.com/

Thanks.

Hi Viewer,

I went to vocativeaudio some weeks ago. Many of their products are out of stock and they need to order for me.

My stock of 2227, 2228, 637 and 2107 will arrive next week. I will try them one by one. Then I will see if I can get the 627AM from diykits. Hope that I can get from them.

Many thanks!

Hi viewer,

Wa .. you have been modifying your CD 33 since last year! I go back to the FIRST page and realised that you spent so much effort to test things out and share all these findings with us. Great JOB!

I will consult you more as I further mod mine in the coming months.

hi alfcat,
welcome.

Hello Viewer,

My OPAMS will probably arrive these few days and so will my Bendix 2C51 tubes.

I checked back the photos you posted and realised that you have modified your CD at least two times. I am now planning for the next stage of changing the caps. Where would you suggest me to start off with. I would say my budget is just HK$ 2K maximum and I like Vocals more.

Please advise. Many thanks