opa 627bp in MHZS cd33

[quote:0f799a10ed="alfcat"]Dear t.,

Oh, the 7806 is a regulator .... I see.

What do you suggest I change to? And you said I should change to a larger Heatsink for it, right?

CAT[/quote]

Maybe something like these which can handle 1.5A current http://uk.farnell.com/jsp/Semiconductors/power+control/STMICROELECTRONICS/L7806CV/displayProduct.jsp?sku=9756094

You may still get more of a voltage drop when using the Bendix  though.
If you feel the 7806 is getting too hot using the Bendix its worth replacing it with a taller heatsink to help lower temperature, just make sure it will physically fit

[quote:2dc6315ea3="alfcat"]Dear t,

Do you have more photos of your cat? It looks like we have some cat fans here as well.

KK Ho likes cats too.[/quote]

Heres a few  

http://pic20.picturetrail.com/VOL1293/4634025/12749957/286233568.jpg
http://pic20.picturetrail.com/VOL1293/4634025/12749957/286234015.jpg
http://pic20.picturetrail.com/VOL1293/4634025/12749957/286233565.jpg

hi alfcat,

I finished the modification of my Cayin cdt-15a
1. re-moved the power filter.
2. add clock for transport.
3. changed IC to opa627bp.
4. changed wires of output to cardas.
5. replace some caps on tube pcb.

its sound is greater than my MHZS cd33 heary modification.

photo :http://i107.photobucket.com/albums/m289/viewer_2006/SANY0488.jpg?t=1194446148
If the cd33 have many problem I suggest to changed it to cayin cdt-15a, it will be let you have amazing sound after modification.
thanks.

photo: cay in cdt-15a

http://i107.photobucket.com/albums/m289/viewer_2006/SANY0488.jpgp

photo: cayin cdt-15a mod


http://i107.photobucket.com/albums/m289/viewer_2006/SANY0488.jpg?t=1194446482

Dear Viewer,

No wonder you were so "quiet" these days. Ha..ha... you were busy modifying your Cayin 15a. No wonder.

Been VERY busy these two weeks. My CD 33 is okay now after I changed the White / Grey Flat Cable. The Chinese Sales gave me two of those free of charge.

I bought a LITE DAC-AH today in China. I was hoping to use the board in the CD33 but need to figure out HOW it should be done first. "t" is telling / helping me in the other thread.

To my surprise, the LITE DAC-AH standalone makes a lot of difference. I plug it in to the Matisse and my wife says "Wow ... what happened?" The Depth, Openess and Clarity all improved. As the Matisse got more than ONE input, I can switch between using and not using the DAC by the turn of the knob. Even my daughter feels a lot of difference there. Just hope I can inplant the PCB into the CD 33 later.

Will try to understand more of your Cayin modification after I finished marking all the exam / tests.

Thanks for your sharing

CAT

Hi alfcat

            I am newbie to the club here, like u i also brought a CD33 and follow some of your mods,  which made it sound good, but when i put it next to my friends Linn karik-Perpetual P3a, his sounds more space and more musical then my poor CD33, although the CD33 makes the vocal more forward sounding then my friends setup.
             Coming to the point, can i improve my my CD33 with a lite Dac-AH or the P3A Dac(which i can get secondhand) which 1 to buy?

Thanks

Dear KKwan,

Ha..ha.. I am also NEW; just join this forum in April or so.

I am not an "Electronics" man but I can share with you some of my experience.

The CD33 to ME is an experiment only. It produces acceptable sound, especially female vocal at a very reasonable price. But if you like other types of music as well, e.g. classical ... it performs pretty poor. If you want a full range CD player, I would say you have to find something else rather then the CD33.

The LITE DAC-AH brings in some improvement. I have it as external now as I don't have the time to put it inside the CD 33. I got the LITE at $ 650 and it shows some improvements only (for certain CD but not all).

Follow the other links here and you can see what Koifarm, t, KIKO and the others had done / suggested to improve the CD33. These guys are more knowledgable than I am for SURE ....

If you need further information, just drop me a note.

CAT

I am newbie to the club here, like u i also brought a CD33 and follow some of your mods, which made it sound good, but when i put it next to my friends Linn karik-Perpetual P3a, his sounds more space and more musical then my poor CD33, although the CD33 makes the vocal more forward sounding then my friends setup.
Coming to the point, can i improve my my CD33 with a lite Dac-AH or the P3A Dac(which i can get secondhand) which 1 to buy?

Dear KKwan

Because you already have the MHZS player, you should buy an external DAC like the lite DAC-AH. Now you can play vocal music straigh from the MHZS player and instrumental music from the lite DAC-AH.

A little mod for the lite DAC-AH i can recommend. Bypass the opamp section by taking the left/right output straigh from the I/V resistors with a 10 uF condensator. The DAC-AH improves in detail and space.

Hi all,

Thanks alfcat  & Koifarm for your advice on the dac-ah.

What Electron Tubes u use in your CD33, i replaced the original 6N3 with the JAN 5670W found that its sounded a bit restrained, which other tubes to replace the 6N3 apart from the WE396A which i dont know where to get it from.

All so any body know where i can get a replacement remote control for the CD33 my 1 stop working and the price for it, i dont want to go through Ebay.

Thanks for your help..

Dear KKwan,

I got a pair of Bendix, which is pretty good. I am now switching to WE396a as I got it some time ago. To me, the two pairs sound very much alike.

CD 33 remote? I can check with the Chinese Sales I deal with. Don't expect an answer until one week from now as he checks mail not very often. We will probably go again in December, if the price is right, I can get it for you.

CAT

Hi kkwan,

have you replaced the remote's cells.

Hi viewer,

i Know what u trying to say, yes i replaced the battery a few time, no reponse. its ashame that its such a nice romote....

Hi kkwan,

did you check the wire in the remote ??????
normally remote not easy out of service.
if very thing is fine, you may order a new once, alfcat may help you, because he know the shop for mhzs cdp in china.
good luck.

Dear KKwan,

I already sent the message to the Chinese Sales. Will give you a reply once he informs me about the price of a new remote.

Still discussing with my colleagues WHEN we will go up again; likely to be in Dec as we will be having our exam next week.

CAT

Dear KKwan,

Please drop me your telephone number at achan@sjc.edu.hk. I will contact you for repairing your CD 33 remote.

CAT

hi Alfcat and Viewer

           I check the voltage output on the led(on the remote) when the button are press, there is voltage difference, so i presume the remote is working.
           But this leads to the recieving end, in the CDP the sensor or any of the circuit todo with it. All the control on the cdp is working fine, any idea?........


thanks

PS.   Alfcat good luck with your exams

Dear KKwan,

I haven't receive your email.

Oh, that is not MY exam., my students' exam. I am a teacher.

CAT

Hello Alfcat

Sorry my fault,  my son was guessing you are a student, but anyway good luck with your students exams............
I had sent the email to you

Thanks

Dear KKwan,

You can still mail me the remote if you want me to test it out for you. OR you can find someone who has a CD 33/66/88 and test it out. They use the same remote.

If you want to mail it to me, make sure you put INSURANCE on it. I lost two packages with the Royal Mail in the past.

We should be going up next week or the week after ....

CAT

Hi Alfcat,

Thanks again for replying,

The CD33E sound getting better, after i change the position of my speakers, or its getting burn in with the upgraded components.

alfcat can u give me your address so i can send the remote to you,
and should you gone to china before you receive my remote, can u get me a new remote, i will pay you later is that ok?


Thanks alfcat

kkwan@btopenworld.com

PS i us to have a Black persian cat called Garfield, is your a white      persian with blue eyes?

Dear KKwan,

I will send you my address in my next email to you.

If your remote can't arrive on time, I can get you a new one and once your problematic one gets here, I should be able to get it fixed for you as well.

My WHITE cat is a Angora. My Black cat is a Persian.

It looks like many Hi Fi Fans are CAT and Aquatic Plant Lovers.... ha..ha...

CAT

Hi alfcat,

Have you received the remote yet from DHL, i hope it got there on time... Let me know.

Thanks Cat

Dear KKwan,

Up to now, there is NOTHING for me. I will check the office tomorrow.

We will be going back NEXT Thurs. You can also check with DHL whether they had delivered the package or not.

CAT

Hello

Do you know, is there in the latest models of mhzs 66E dip8 socket  already, because it looks like the pictures that there is? I´m not so good of soldering ...

I suppose that mhzs`s opa2064 is not genuine TI`s?

Mikko

Dear Mikko,

MHZS changed their PCB once or twice. The OLD ones are direct soldering. They use better quality capacitors on the other hand and better cables for connection.

The CD33 I have got a Dip 8 socket for the OPA2604. However, the capacitors are of a poorer grade, and so is the cables.

Well, I can't tell whether it is genuine BB. I changed it to a pair of OPA627AM anyway. The improvement is very significant.

Finally, I followed Koifarm's advice, completely by-passed the OPAMP section with the DAC-AH installed inside the CD player. VERY impressive performance.

CAT

Thank you for your answers.

So it´s maybe possible that I can just take off opa2604 and put opa2107 instead without any soldering?

I hope you don´t mind although I have the dog ...

Mikko

I don't think they will go back to the previous version PCB. Mine is 2006 Aug or so ... there is already a socket for the OPAMP already.

I used BB OPA 2107 at first. Pretty good improvement over the original 2604 (so called). However, if you haven't modified other components, the 2107 gives off too high pitch (even distortion) at certain times (female vocals).

Finally I used a pair of 627AM. But now, my CD 33 is dead and I am selling it off as scrap / spare parts.

I used to have two dogs too. When cats were brought up together with dogs, it is always the cats which bully the dogs. BEST example =Garfield & Odie

CAT

Dear Viewer,

Understand that u had recomve the filter at power supply. which part of the filter you remove? u remove the inductor and coupling cap for the AC?

Dear KK Sir,

Do you think the AC filter is good or bad for audio system?

hi windwss,


I had replace  the filter at power supply of my cayin cdt-15a which is follow this web site
http://www.wowhififever.com/Untitled005.htm
the original and modified 15a photos are enclosed for your easy reference.

I  removed the power supply filter.
add power supply for two re-clocks.
changed output caps and iv op amp from BB2604 to BB627bp

now the sound is very great.


thanks for sharing.

cayin cdt-15a modified version.

For all the MHZS owners, the best mod is the opampless/passive filter mod. For just $ 1,- on parts you got a lot of more detail.

Here we mod about 30 MHZS players and everyone liked this mod the most.

Look here:

http://gathering.tweakers.net/forum/list_messages/1283078/0

For the next one you need to register.

http://www.roehren-und-hoeren.de ... 178&start=0

Dear Koifarm,

You used the same Clock PCB as we do, ha..ha...

I posted the Spark Cayin CDT-17A schematics in another thread. Any idea how to make it better?

CAT

To ALL,

I followed similar modification and I also installed a LITE DAC-AH board before the 0.22uf caps. The improvement is VERY significant.

Really need to thank Koifarm, T and Kiko for their help here.

CAT

Dear Viewer,

I had remove the AC filter in my Bada CDP, the sound is more analog & natural & smoother now but seems lack of some excitement less punch....

hi, windwss

that is the result of remove the AC filiter.
the sound close to original.
do you like this sound ???
if you like it, that this modification is succesed.
can you post it for sharing ???????

thanks.

Dear Viewer,

I didn't take the picture as it is just a simple mod.
May be too use to some of the colouring, after remove the filter need some time to adapt. Generally i like to sound after mod especially when listen to vocal.

By the way i had also modify my Montor Audio old speaker with Mundoft Zn cap. I'm wondering why the Mundoft cap not popular use in HK? I myself feel that the mundoft Zn is much better than the Solen & ERO cap. The price also acceptable e.g a 3.3uF/250V is ~RM40/pc (~HKD75)

Dear windwss,

100% agreed.

I also used Monitor Audio old speaker (model 14 stand speaker) and replace
the e-cap to Rifa box film cap, which provide very clear sound.
the Rifa box cap is enclosed, i buy in 2 hand market around HK$20 each.
the reference photo is enclosed for easy reference.
http://i107.photobucket.com/albums/m289/viewer_2006/6_76535.jpg

Mundoft cap is popular in hk diy field.
normal only can buy high grade of it so very expenise.

thanks

I use MA R100, product of 1989, metal tweeter but paper woofer.
i purchas eit 2nd hand the casing not so good so i had vanish it, i also use the silicon glue in side the casing to enhance the strength of the box and paint the black Tar at the inner wall. place 2 sand back in the box as well.
CAP REPLACE WITH MUNDOFT zn, RESISTOR WITH kIWAME.

Anyway, i found the original speaker hook up cable is quite good so didn't change it.

Hello guys, I recently bought MHZS CD33F from Ebay and I am very much dissapointed by the sound. It is very bad and dull ... Can you guys help me in modifying this CDP ??? I need your help I want the sound to be like Marantz  

you just need t to browse through this forum u will get a lot info how people here mod the CD 33 but becareful...this is fragile unit for modification....good luck!

Thanks WINDWSS! I have read most of the posts in this forum regarding CD33. I plan to change the Opamp to a original OPA2107 and change the Diodes and Capacitors...Would this suffice??

HI, MUSIC111,
YOU CAN TRY CHANGED OP AMP TO BIG S 5534 SINGAL AMP WITH ADAPTER.
I USED 5534 IN MY CD-33 NOW AND FEEL THAT SOUND IS BETTER THAN OP AMP 627 AM.
JUST HK$15 FOR BIG S 5534
ADAPTER JUST $20.

IF THE SOUND REACH YOUR CUP OF TEA. NO NEED TO CHANGED OTHERS.
IF YOU WANT TO BIG MODIFICATION, YOU CAN FOLLOW THE ABOVE TO MODIFITY.

THANKS FOR SHARING.

Wow, who is back?

Long time no see, Viewer! I hope you are not badly hurt by the Financial Tsunami.

Glad to see you back and continue to share your experience with the CD 33.

Hello alfcat, viewer and music11.

A little update, here in the Netherlands there are a lot of problems with the MHZS players. There are a lot of people who had a defect DAC. The voltagestabelisor for the DAC oscillates and runs hot.  Then the voltagestabelisor fails. and the DAC burns. You can reconnice a bad running stabelisor by its to high tempature. To solve this  selfoscillation problem ad 2 x 100 nf capacitors at the bottom of the stabelisor.



For those who has a defect DAC or like to upgrade to a much better DAC and sound. Look at the picture below.



For more pictures look here:

http://gathering.tweakers.net/forum/list_messages/1283078/6

hi alfcat,
really long time no hearing from you.
how are you and your family.

my business field is really hurt by the Financial Tsunami. my income 50% reduced. so leak of money to modifity anything.
just enjoy in listening.

i found that you are expert in diy hifi now.

thank you.

Thanks you guys for your advice...

I am just starting my DIY activity on my CD33F. My unit has OPA2107 already. I think it is not genuine and so I decided to change the OPAMP to a original 2107 after taking the advice of an expert in another forum. Then change the diodes to UF4007 and then change all the fake rubicon caps. He has done the above mentioned mods and says that the sound is like Marantz !!

I am from India and it is very hard to get any parts here. Most of the caps that are sold here are fake imports.

As of now, the sound from CD33F is very very bad and my Sony sounds better than MHZS

Dear Koifarm,

This is very nice of you to share your experience with the MHZS players here.

Have you figured out what actually caused the "can't read" problem with these MHZS players?

Recall my last one, I put in the disc the the disc even turn ANTI-Clockwise instead of the usual clockwise .... never got any experience like this with other CD players.

I really like my CEC player. It gives wonderful music. I have heard that this Belt Drive player is VERY expensive in Europe.

CAT

[quote:354beed58b="alfcat"]Dear Koifarm,

Have you figured out what actually caused the "can't read" problem with these MHZS players?
CAT[/quote]
Dear Alfcat,

Until yet i have solved all the " no disc " problems. The connector from the white flatcable of the drive makes in the middle of it no contact. I provide some pressure with a tongs in the middle, put the cable back in and mostly the problem is solved. Sometimes i must do it twice.

I do not know the CEC players, but it is great you like them. I still like my modified shanling CD-T100se. This month at a meeting in Germany they liked my shanling also.



more pictures look below.

http://www.roehren-und-hoeren.de ... asc&start=0