Just received one CD63SE and one CD67 MKII from two of my friends requesting me to carry out some mods for them. Modding work will only commence when I have the time.
I have never modded a CD67 before and therefore before I proceed I compared the SQ of the two stock CDPs and to find out which one actually performs better. I have the feeling that CD67 should perform better as it is of newer design.
To my surprise I found CD63SE performed much better than the CD67 MKII in their stock form. CD63 is much clean, clear and with better sound separation. Looking at the circuit diagrams the audio part are almost the same while the servo control are of different designs. I believe CD63SE out performs CD67 MKII may be due better design of such (and correct me if I am wrong). I wonder if others have the same findings ??
I have never modded a CD67 before and therefore before I proceed I compared the SQ of the two stock CDPs and to find out which one actually performs better. I have the feeling that CD67 should perform better as it is of newer design.
To my surprise I found CD63SE performed much better than the CD67 MKII in their stock form. CD63 is much clean, clear and with better sound separation. Looking at the circuit diagrams the audio part are almost the same while the servo control are of different designs. I believe CD63SE out performs CD67 MKII may be due better design of such (and correct me if I am wrong). I wonder if others have the same findings ??
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I guess the 67 is not the -SE or -OSE version?
Then the CD63SE has larger and better caps in some areas, and the power transformer is different, so I expect this to be the reason why it sounds better.
Then the CD63SE has larger and better caps in some areas, and the power transformer is different, so I expect this to be the reason why it sounds better.
The 67 is a MKII (not a basic 67) which is similar to a SE. The size of the TX is similar to that of 63SE.
You're probably talking about a 15 year old machine at this point, right? If it's all original then perhaps some of the capacitors in the 67 are getting a little long in the tooth. I imagine these machines could deteriorate to differing extents depending on how much they've been used and how warm they've been kept.
Edit: My impression of listening to a stock CD67 (can't remember which kind) was that it was smoother and less veiled than a 63 in stock form. I thought female vocals were more clearly separated and more realistic, particularly sibilance.
Edit: My impression of listening to a stock CD67 (can't remember which kind) was that it was smoother and less veiled than a 63 in stock form. I thought female vocals were more clearly separated and more realistic, particularly sibilance.
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Yes Ben you may be right. The old caps could be the main reason why the CD67 performs not as good as CD63 at this point in time.
Henryyyy, hope this helps...
I have positioned the 2 halves of the DOS board as shown and mounted them either side of Ray's flea board. All 3 boards fit (just) on one side panel of the player. I have not quite finished yet and all will be tidied up and positioned correctly in due course.
Just to add... to fix the DOS to the side panel of the player, I super-glued a nut on the mounting hole in each DOS board (making sure it was in exactly the right place). Then it was easy to drill a hole in the side panel and screw a bolt through the hole and into the nut, thereby holding the DOS board in place.
Hi folks, I'm about two hours into listening to the Jung/Didden Pos/Neg Super Regulators in my DOS as an upgrade to the 7812/7912 regs that I had before. I'm a bit too excited to be really objective, but my initial impression is excellent. The most immediately noticeable impression of improvement that I have is in the stereo imaging and timbre of instruments, particularly percussion. Drums sound so much more realistic in presence and placement. I'll have to give it a few days to be sure, but I don't think I'll be holding a candle to op-amps any more.
Fitment-wise, I'll post a pic tomorrow but I have the Super Reg boards mounted on the right wall of the chassis where they fit perfectly. I think this PCB is a no-brainer as a compliment to Ray's DOS for anyone like me who is all about the DIY solutions.
Fitment-wise, I'll post a pic tomorrow but I have the Super Reg boards mounted on the right wall of the chassis where they fit perfectly. I think this PCB is a no-brainer as a compliment to Ray's DOS for anyone like me who is all about the DIY solutions.
Hi, I am just putting in the transistors on my DOS-CFP board and was wondering which are best to use. There were some posts back in 2011 that said 2SA105s are better than the BC560s(see post 17481). What are people's experience with transistor swapping? Henryhttp://www.diyaudio.com/forums/digi...ntz-cd63-cd67-mods-list-1749.html#post2719981
@henryyy: I read those posts too, and went with Brent's component choices for my DOS. I purchased matched pairs of the following transistor types:
2SK170BL
2SA1085E
2SC2240
Note you have to permute the legs on some of them.
2SK170BL
2SA1085E
2SC2240
Note you have to permute the legs on some of them.
Hi Ben, Nice work, where can I buy the super regs from?
Henry
Is there a post that details Brent's configuration?
Henry
You can by the Super Reg PCBs from the DIY Audio Store. I got all the components from Mouser, but any of the usual suspects should do.
Brent's post 2720089 originally linked to a schematic with his changes, but that link no longer works.
Brent's post 2720089 originally linked to a schematic with his changes, but that link no longer works.
I am guessing that Brent just replaced the BC560 (T3 and T4) with 2SA1085E and BC560 (T5) with 2SC2240. The rest are 2SK170. I couldn't find 2SK170 but bought LSK170A (from micross) which are supposed to be a direct replacement. I hope this works! Henry
I forgot - the LSK170 range has a narrower LDSS range than 2SK170 (which is 2.6-20mA). I bought LSK170A (2.6-6.5) for T1and T2, and LSK170B (6-12) for T6 and T7. I am just guessing these ranges based upon the current at R11 and R14. Henry
I got matched pairs of the NOS transistors on eBay.
I just did a quick search and they are currently available.
I will try to find out Brent's modifications for you.
I just did a quick search and they are currently available.
I will try to find out Brent's modifications for you.