opa 627bp in MHZS cd33

hi alfcat,

i am leak of money now, so I must earn money first.
the brand new cdt-15a is around HK$4,300.
its sound is better than cd88 if  no modification.
i suggect you to buy one in 2nd hand market, because no china's cdp
like it now.
thanks.

Dear Viewer,

Finally my CD 33 is back to normal. I just replaced all the Jensens and the Nichicon back. Haven't touch the diodes yet. Also, almost forgot, add the clock back as well.

The CDT-15a seems to be a nice machine. It got 3 different sets of outputs and the materials used are far better than the CD 33. I think it must be expensive in the first place .....

So are you going to MOD it in the near future?

Dear t.,

Your photos are bit too small. Hi Fi Fever allows photos up to 1M. You can trim them until they are close to 1M. As I am an amatuer, I would really like to see more details so that I can learn from you.

You mentioned the Zener. Can you HighLight them to me where they are located?

Your clock seems to be an interesting one too. You got it in UK or ...

Your help is highly appreciated.

hi alfcat,

this web site for cayin cdt-15a for your reference.


http://www.my-hiend.idv.tw/machine/cdt15a/cdt15a.htm


thanks.

hi alfcat hing,

yesterday i buy a cayin cdt-15a in 2nd hand market,
the photo is enclosed for your easy reference and sharing.

I will upgrade it later.

thanks.

Next I'm going to remove all the op-amps supply because its no longer used,  I'm also going to remove the dacs regulation circuit and replace with a better low noise ALW super regulation

Hi Guys,

I'll try and post some more closer pictures later,  nothing much to see though really. Also I have only had this CDP for a few days so not had much time to try everything yet :wink:
yesterday I bypassed the op-amp,  the sound is much better in my opinion,  I did the same as posted here by h3d (thanks h3d)  http://www.hififever.com/forum/viewtopic.php?t=952&postdays=0&postorder=asc&start=250
it shows a diagram of the original circuit at the top and modified at the bottom,  notice the resistor changes too for the tubes

The details for the Zener mod are here, http://www.hififever.com/forum/viewtopic.php?t=1332   kk_ho  is correct regarding the roll off,  this mod improves High freguency  (thanks kk_ho)
I changed the pair of 100v capacitors to higher voltage types

Hi t,

u replace the 75V zener with 100v changing the value of other resistor & capacitor at power section right? when u increase from 75V to 100V, the current also increase, you won't find your resistor is very hot??

actually what the chatode & plate resistor in cd33?

ss

Dear t.

Welcome to the forum. Thanks for sharing your findings. It is always good to see people like you around to teach me more as I am a complete amatuer in electronics.

It will be nice if you can send us photos of different sections of your
CD 33. I can see that you have a new clock, something seems to be a power supply on the left ... but the photo is a bit too small for the purpose.

As Hi Fi Fever only allows photos of 1M or so .... I think you have to do several ones. Really appreciate if you could do that for us.

Cheers

CAT

Hi Guys,

I'm new to this site and have been reading the various CD33 threads with interest.
Please be careful what type of op-amp you try in this cdp,  some of the fast high bandwidth types are not stable in the circuit without additional modification and may suffer oscillation causing the op-amp to overheat.
The decoupling layout is quite poor in these cdp's, theres no local decoupling capacitors close to the op-amps pins etc.

I'm going to try bypassing the op-amp same as forum member h3d.

Uk member Pinkfloyd kindly gave me his CD33, he started a few mods including replacing the 1N4007 diodes with UF4007's,  replaced the pair of 0.22uf caps after the op-amp to 2.2uf Epcos films and a few other capacitor changes.
Mods I have done so far is replace the heater supply diodes to 1N5820 and  the 4700uf 16v smoothing cap before the regulator to a Panasonic FA.
I have replaced the dacs decoupling caps and dac bias cap to Rubycon ZA,  the XO clock has been upgraded to a low noise super regged type run from a separate mini psu
kk_ho's mod of replacing the 75v zener in the psu to 100v

hi alfcat

photo cd-33

Hi alfcat,
i have upgraded all diodes to philips PBYR 1060 and philips BYV96E.

sound become more clear and detail very much. anyway is very great for all ranges.
if close the eye to listen, its sound like HI End cdp.

My cat also stand in front of the speaker to listen the sound, he is very enjoy.

photo will be posted later.
i am waiting your call to collect the sony 213Q CD Head with diver.


thanks for sharing

Dear Viewer,

I think the PBYR 1060 should be 10A (Philips brand). I am not too familiar with those DATA SHEET but it says there its Average Rectified Forward Current is 10A. The one from the shop you wrote me carries a different brand.

Hi Viewer,

Sorry for my late reply. the diodes is philips BYV96E. :wink:

ALFCAT,


OK . NO PROBLEM.

THANKS.

Dear Viewer,

I got a call from the seller. They won't be able to deliver the SONY heads because of the Golden Week. The courier won't be working until earliest Thurs.

Will probably arrive on Friday. Call you by then.

Dear Viewer,

I got more of those PHBYV96E. If you need more, just tell me.

The SONY CD Heads are also ready. The person in China will mail them down to me next Tues or so. Very reasonably priced for the whole transport mechanism. He said it is not "re-cycled" ones but I haven't got the chance to open a package and check.

Will ring you up after the CD Heads arrived.

hi, superwhite,
I want to replace the diodes of cd-33, and
I would like to request you that what reading of the diodes of the cd-33 in white are?????? there have 13 diodes.
which show in the your photo is enclosed.


thanks.

Dear Viewer,

I won't give up DIY; but still I need to learn the lesson --- don't rush myself and be more careful when doing DIY. I should never take things for granted and don't be over-confident with myself ... ha..ha..

I think a safe bet for the BIG diodes is to use the PBYR 1060. KK Ho got quite some of them. He said he also got 80100 and others.

Hi alfcat and superwhite,

Thank you for your advise.

Alfcat, don't give up to diy. this just a experience on diy.
your cd-33 can work as transport with external DAC.
Alfcat thank you for you some doides. I will report the result of changing diodes.

thank you for sharing.

[quote:4b65ef911e="sound focus"]Dear all,

I am a Hifi Fever member that using Adhader08 as my nick name previously,
due to didn't log in to this forum for a long period until the password also has been forgot.
It's is a good news to see there are few new members join this forum and modifying the player lately.
Since the circuit no so reliable but modification or upgrade is a must. my personal advice is first to upgrade the tube and Op-Amp. WE, Tungsol and Bendix are the only tubes which acceptable. WE having the outstanding performance among them, WE giving me a very comfort level of listening, live like music...........

Enjoy. Wink Wink Wink Wink[/quote]

Welcome back, Brother =D>

Hi Viewer,

i have no idea the BYV96E can be replace to the Big one, but for your information, the original diode was the 5404, 5404 is 3amp, but the BYV96E only 1.6Amp.... so it look like a bit risky.... so i replace the 5404 with BYW96E.

n the small one original  is 4007, so it will be 1amp or less. n this  i use BYV96E.
and the E is stand for 1000V, so think it won't blow unless you have 1000V on it...
hope this will help... :roll:  
if you need some more info on this two Philips diode , i have technical data, is  PDF files from philips, i can email to u if you want, just let me know. :wink:

Dear Viewer,

You can check the Data Sheet for those Philips Diodes. I don't know how to interpret those data .. ha..ha..

I am not sure whether they are 1000V or 100V, you better double check.

Hi superwhite,

Many thank for your information.
I just got  the PHBYV96E and the PH-33D from alfcat hing. are those can replace original small 4 pics replace to PH-33d large 4 pics for PHBYV96E????

Thanks.

Hi Viewer.

Sorry for my late reply,

the diode is made by Philips, the part no for the big one is BYW96E, 3.1Amp 1000V. n the small one is BYV96E, 1.6Amp 1000V. Both is Fast soft-recovery controlled avalanche rectifiers. Hope it help. :wink: (but heard philips has stop both production)

Viewer 兄,

No problem. I have the PHBYV96E and the PH-33D.

May go down to Wan Chai in the afternoon. If you happen to be free, I can take them with me there.

Got 4 PH-BYV96E left and 8 PH-33D

hi alfcat,

call you tomm afternoon.

thanks.

Dear Viewer,

You want those Diodes? I have some of those in excess. You can give me a call if you want them.

Won't be able to answer call during Sunday 10 - 1pm because of Sunday Service at Church... :wink:

Hi superwhite,
long time no hearing from you, how are you,

I want to follow you to upgrade the diodes of CD-33's diodes of power supply.
which marked  (Philip) at you photo posted before as
would you mind to give the moude and reading.


Thanks.

Hi,

I modified my CD 33 following the path many of you chose. The sound of the CD 33 was far better than I first got it.

The first step was changing the Tubes to WE and later Bendix. Next, I replaced the 2604 with the OPA2107. Third, replaced those WHITE MCaps with Jensens. Replaced a couple of capacitors with Elna, BlackGate, etc.

The only problem is, after all these modifications, the S/N Ratio is still low at 65dB or so. Finally, I took KK Sir's advice and work on the Power Supply section. Changed the diodes and the capactiors there ... Wa la ... the S/N ratio jumped to 78dB minimum. I can get back some of the details I lost in the past.

Dear all,

I am a Hifi Fever member that using Adhader08 as my nick name previously,
due to didn't log in to this forum for a long period until the password also has been forgot.
It's is a good news to see there are few new members join this forum and modifying the player lately.
Since the circuit no so reliable but modification or upgrade is a must. my personal advice is first to upgrade the tube and Op-Amp. WE, Tungsol and Bendix are the only tubes which acceptable. WE having the outstanding performance among them, WE giving me a very comfort level of listening, live like music and sweet vocal which Tungsol and Bendix can't deliver. BB627AP is my first option for upgrade. Wider, deeper sound stage and clarity are the main improvements after changed from the original BB2604. And when I installed AD797 before, it's disappointed me.
Finally, I suggest to change all the capacitors in the player. Blackgate N, NH, NX are the best E-Cap I had tried, Nichicon also can be considered for those who don't want to invest to much into it. There are plenty of brands of film cap for you to chose like Audionote, V-cap, Jensen, Mundoff and Hovland, it's all depend the result you intent to have because different brand have its own characteristic.

Enjoy. Wink Wink Wink Wink

Dear all,

Hi Viewer, Hi Superwhite, Hi Windwss

I'm Abhader08

Mine cost me around HK$ 800. You are in Malaysia? Should be around $280? in Malaysian dollars?

Hi, Alfcat,

At power sides, imo BG is the best. If compare to Elna BG is lower noise with better detail/resolution. But damn expensive especially for high voltage cap.

Dear DIY friends,

Viewer is just kidding. I learnt a lot from you fellows. Mr. K.K. Ho also taught me some nice and neat tricks. He told me that I should go ahead and do the Power Supply part of the CD 33 first (provided that my CD 33 has no wave form distortion).

I did go ahead and followed KK advice. Change the capacitors to Black Gate (a bit expensive. I would say Elna should do the job). Change the caps on the Digital portion to Sanyo OS-CON. Finally, took out the diodes and change part of them to 1060. Took me almost 2 hours to have everything done. But the improvement is audible. Now waiting for the Black Gate to run in.

You can also check the posting I did in the other thread.

http://www.hififever.com/forum/viewtopic.php?t=1619

Keep in touch

[quote:31d0895900="superwhite"]Hi Bro VIEWER n WINDSS,

i'm back!  :wink:  how are u lately? n how was your CD33? hope you can enjoy it much as i do.   pls up date me with any new thing impliment on your CD....

Hi bro alfcat
nice WE tube, i love it so much..... hope you like the lovely sound of WE, as i enjoy this tube so much.... [/quote]

Recently just start DIY simple amp, 1 is the simple headphone amp (shld be finish by this weekend).
Another project is DIY a preamp using 6N3 tube.... still in the process....

ss

hi superwhite,

I am fine. Are you?   
I have no new project for my system, i am enjoy it.
our  friend Mr.Alfcat, he modifity cd33 very well, i will follow him to modifity too.
Any new suggestion for improvement on cd-33??????
Any mew project for you system ?????

Thanks.

Hi SuperWhite,

It has been a while. I always wonder where have you all been. I have learnt a lot from you guys in this forum on the CD 33 thing. Thank you so much for sharing / teaching me as well.

I have done some other modification after you guys finished your job on the CD 33. I posted them in the DIY forum. Since many people here are not comfortable with English, so I write all those in Chinese. Can you read Chinese?

The WE tubes are EXCELLENT! I love them very much. I also have a pair of Bendix but the WE gives better gain and better S/N ratio. I am thinking of acquiring one more pair. However, it is not easy to find and quite expensive too.

Keep posting  :wink:

Hi Bro VIEWER n WINDSS,

i'm back!  :wink:  how are u lately? n how was your CD33? hope you can enjoy it much as i do.   pls up date me with any new thing impliment on your CD....

Hi bro alfcat
nice WE tube, i love it so much..... hope you like the lovely sound of WE, as i enjoy this tube so much....

Dear KK Sir,

> They are Hi Fi Lo

I don't understand. What do you mean by the above?

Inspect your CD player.........

They are Hi-Fi Lo

Hi Viewer,

I have been VERY BUSY these few days as all of a sudden, the EMB said they need to come to our school for inspection ...  :?  Need to prepare all the necessary documents.

I have used the 2 to 1 IC stand and put the OPA 637BP into my CD 33. However, didn't have the chance to test it out as I put them in at 6am this morning (working all night for the papers).

Will tell you how I feel about the 637BP later tonight (after 8pm) when I got the chance to make the comparison.

Will try to do the CLOCK thing by the end of this month after I got my pay cheque.  :wink:

Dear KK Sir,

You mean you will go back to Hi Fi Fever this Oct?

I would say YES  =D>  if you start a class for modifying CD 33 / 66.

This is one cheap machine to start off with and there is plenty you can do.


BTW, is there anyway you can help me to test whether my CD got any distortion?

秋官 said you probably mistaken me with another colleague of mine -- 肥鍾, who is the English Teacher and you helped him to modify the Marantz CD 80.

When I back to work in hififever after Oct.

I think the first teaching class is

CD modification for MHZ 33,66

Any comment ?

107574 people viewing this post

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Hi alfcat,

2. Right next to the RCA plugs, you have ONE SILVER colour cap. That is the 0.33uf/630v. That is also a Jensen copper  Foil Oil Cap.

3. These are the same ratings of the original e-cap.

4. I suggest 0.1uf  to put on the OPAMP PCB.

Thanks

Dear Viewer,

Just to clarify something. On Page 3 of this thread, you posted PHOTO1 which shows the layout of the area around the TUBES.

1. Right NEXT to the tubes, you have TWO Jensen Copper Foil 0.22uf/630V.

2. Right next to the RCA plugs, you have ONE SILVER cap. That is the 0.33uf/630v. That is a Jensen Aluminium Foil Oil Cap.

I decided NOT to change the Power Supply side caps now ... as out of money, ha..ha..

3. Do you recall the ratings for the Nichion Muse e-cap and the Elna A3 e-cap?

4. What cap (& rating) do you suggest me to put on the OPAMP PCB?

I will go to SSPo and Mongkok to get the caps today. Will start the modification tomorrow after my BB finished all her exam. Will post the photos by then.

Many, many thanks for your help and advice!

My Stock of WE 396a.

The 12-51 are very close to MATCHED.

The 10-51 has a lower rating.

Hi Viewer,

Thanks for your call and advices.  

My Bendix 2C51 arrived. Plugged them in and make a comparison with the WE 396a.

Frankly, with my system, the Bendix is even more "natural" than the WE 396a. Vocal is OPEN, CLEAR and SOLID.

Funny thing is, I mentioned about the High Pitch Distortion with the WE. It is not that significant with the Bendix .... I don't know why .... is it because the Bendix has less "requirements" on the equipment while producing good sound at the same time. Whereas the WE 396a .. your other peripherals have to be GOOD to match them.

I am thinking of selling my WE 396a out as now I have the Bendix. I will have a spare pair of Bendix too in the future... ha..ha.. and I have to sell that pair as well.

hi alfcat,

i will call you later.

thanks