After leaving the player running all day again, it sounded wonderful last night. Vocals are brought forward and it's superbly musical.
I then took out the 39pF caps from the DAC outputs. Huge result - loads clearer from top to bottom. The treble is now quite clear and the detail levels have jumped up! A superb and free tweak.
Simon
I then took out the 39pF caps from the DAC outputs. Huge result - loads clearer from top to bottom. The treble is now quite clear and the detail levels have jumped up! A superb and free tweak.
Simon
E-mail sent Ian 😎
No mods today as I've been to see Up in 3D at the cinema (very good, if a bit emotional!), then to the pub quiz. We won
😀
No mods today as I've been to see Up in 3D at the cinema (very good, if a bit emotional!), then to the pub quiz. We won
😀
Hehe, re-sent! It's always a good night when you win at something or watch a good film, both is even better 🙂
I got my cog / gear from Hong Kong, which I fitted this evening. Quite an easy job, and the draw moves nicely once more. However, the "open" button doesn't close the draw like it does for most cd players - is this a feature of the CD-42 or a glitch? The draw closes perfectly when play is pressed.
I might fit those os-cons in on the v-ref locations tonight, as previously mentioned.
Simon
I might fit those os-cons in on the v-ref locations tonight, as previously mentioned.
Simon
you need to push on the door and it will close as soon as the tray moves off the limit switch. Poss one of the reasons those cogs give up the ghost!!!
thats home mine worked from new! Push the tray or press play! My tray button is marked as 'open'
Just checked and the CD50 is the same, clearly marked 'open' but no 'close' in sight!!!
Just checked and the CD50 is the same, clearly marked 'open' but no 'close' in sight!!!
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I've done the V-ref caps. Changed from nasty 10uF ones to 68uF Os-con SA. Seems better but I've not listened to the player much lately so I'm guessing here.
With the iron warm thought I'd also do the op-amp decouplers. They were 100uF caps. I've gone for cheap 1000uF/35V caps to see how that works. But now I've seen a couple more I want to change...
With the iron warm thought I'd also do the op-amp decouplers. They were 100uF caps. I've gone for cheap 1000uF/35V caps to see how that works. But now I've seen a couple more I want to change...
...as suspected the +-15V supply is smoothed before the regs by miserly little 100uF caps! Scrooge himself wouldn't go as low as this would he? I put 1000uF there.
Sounds better again, for sure 🙂
Sounds better again, for sure 🙂
Been listening to this player again and finding the treble a bit too veiled and in need of a lift.
I've put schottky diodes in place for the +-15V power supply (output stage). This brightened things up but gave me a slightly brittle effect. I think that's what shottkies can do unfortunately, you take the rough with the smooth.
In need of further quality I decided to put the RAM chip on its own regulator - just a 7805. This seems to have cleaned things up quite nicely! The treble, in particular, is quite a bit better.
I'll get some pics soon. I may stop here as it now sounds quite decent.
I've put schottky diodes in place for the +-15V power supply (output stage). This brightened things up but gave me a slightly brittle effect. I think that's what shottkies can do unfortunately, you take the rough with the smooth.
In need of further quality I decided to put the RAM chip on its own regulator - just a 7805. This seems to have cleaned things up quite nicely! The treble, in particular, is quite a bit better.
I'll get some pics soon. I may stop here as it now sounds quite decent.
Sold?
What is the RAM chip Simon, what's the impact on sound?
Again, removing these 39pF caps a good thing?
Matthieu still having a friend's CD52 around 😉
What is the RAM chip Simon, what's the impact on sound?
Again, removing these 39pF caps a good thing?
Matthieu still having a friend's CD52 around 😉
Hi Matthieu,
I sold the CD42, for very little money. The new owner is very happy with the sound - he got a bargain IMO.
I don't know about the sonic effects of improving the RAM chip supply because I didn't do a cap there in isolation. I may have done a reg and IIRC it got smoother but I don't well remember right now!
Removing the 39pF caps was DEFINITELY very positive.
I've actually got a CD52 I bought to repair, listen to and perhaps mod and sell on... I might do different mods and I'll post about it on here. I've not listened to it yet.
Simon
I sold the CD42, for very little money. The new owner is very happy with the sound - he got a bargain IMO.
I don't know about the sonic effects of improving the RAM chip supply because I didn't do a cap there in isolation. I may have done a reg and IIRC it got smoother but I don't well remember right now!
Removing the 39pF caps was DEFINITELY very positive.
I've actually got a CD52 I bought to repair, listen to and perhaps mod and sell on... I might do different mods and I'll post about it on here. I've not listened to it yet.
Simon
Hello all - as the happy owner of the Marantz, I can give Simon full marks! The sound is open and clear and his work really paid dividends. I'm using it with a nice DAC from Hong Kong and I'm delighted with my bargain! The DAC is the one Fikus raves about on his Lampizator site.
Hehe, it's a nice machine but obviously not taken far enough if it still needs an external DAC...
Hi Simon - always work to be done! The DAC is from BiglawHK and it's really very crisp for "live" jazz & classical stuff, though I still prefer the modded 42 for rock music. The CD42 sounds very good compared to the CD67 and CD65DX, which were both highly regarded. How's the CD63 coming on?
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