Marantz CD-50 and CD-60, TDA1541, CDM4/19 - Page 49 - diyAudio
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Old 6th January 2012, 08:33 PM   #481
Mayday is offline Mayday  Sweden
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Quote:
Originally Posted by josha View Post
That's what I did and it worked just fine, I had a solder blob on that ground trace under the 7220 that I used to connect the ground but it was pretty much where your green circle is. There might be a 'better' place to ground the supply but you can always play around with that later on!

Glad you're feeling better!
Thanks!

It'll be interesting to see what this mod does for the sound
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Old 6th January 2012, 09:48 PM   #482
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Interesting ???????
Are you kidding.....if you don't think it's miles better then send it to me and I'll finish it off.
The only way it could sound bad is if you have the caps the wrong way round or you've re inserted the transit bolts
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Old 6th January 2012, 10:16 PM   #483
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Interesting ???????
Are you kidding.....if you don't think it's miles better then send it to me and I'll finish it off.
The only way it could sound bad is if you have the caps the wrong way round or you've re inserted the transit bolts


I ment how big of an improvement compared to say... swapping DEM cap.
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Old 6th January 2012, 10:47 PM   #484
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Honestly joking aside.....I wish I could be with you watching your face when you do this mod and press play.

I remember well the first time I powered the 7220 on it's own - I had a huge grin on my face.
There are not that many tweaks you make where they are quite obviously better. I mean like night and day - black and white etc.
You are about to do one of them and you will absolutely notice it.
Forget DEM cap as a comparison.
Thats small relatively speaking.

Full DEM is noticeable, advanced re clock is quite big, re cap of everything and fast soft diodes is noticeable but.... 7220 with dedicated and regulated power supply mod is BIG - period.

Now....hurry up and report back asap - looking forward to this post
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Old 6th January 2012, 11:19 PM   #485
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Forgot.....if you want even more after this you've got to do the same for the SAA7310 ( 7210 in your case ? ) and finally the RAM chip.

Further thrills await......
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Old 6th January 2012, 11:30 PM   #486
Mayday is offline Mayday  Sweden
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I'll have to wait for replacement caps for the ones I soldered in the wrong way when I was stupid enough to work on the cd while running a fever. BUT atleast the TPR, PS, and transformer is ready and waiting.
The CD-50 and CD-60 both have the SAA7310.
But with the transformer for the TPR and the one for the Valab clock...I don't know how much space there's left for more transformers.
SAA7310 and RAM will have to get regs fed by DC stolen from somewhere on the PCB I think.

What I love about TDA1541A when modded, even mildly as it is now, is how much life and fun it brings to the music...I hope I'll get even more of that
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Old 6th January 2012, 11:43 PM   #487
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You better believe it

It becomes very organic and you are going to just love it.
It's maybe a good thing you must wait a while - it takes away the rush to do more plus you'll get it right first time.
Any mistake you make - I've made it too... any explosions you make - I've done the same and always when rushing to get it finished.

I have learned by repetitive electrocution.....it's the only way....hahahaha!

btw - I'm not an engineer and don't always understand what I'm doing at all.
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Old 6th January 2012, 11:50 PM   #488
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Sounds great!

I'll take my time and tripple check everything, trust me

I wonder how a TPR performs in comparison to standard 7805, LM317(standard config) etc?
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Old 7th January 2012, 08:55 AM   #489
josha is offline josha  United Kingdom
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Think of it like this, the 7220 without it's own PSU is corrupting everything else in the player so by giving it it's own PSU your not just improving that part of the process but every aspect of the player at the same time. This is a MASSIVE improvement!

Changing between a 7805 and a 317 for that PSU will bring improvements but only to that process, so I suspect it is nowhere near as monumental. That said, once you have the dedicated PSU's in place, the clock, decent components and an output stage, any changes then become much more noticeable. I'd be very interested to know if there is big difference between the TPR and standard 317/7805 implementations, I may be able to find out if I haven't already destroyed my stock of 317's!!

I've made some big mistakes with my player also, the worst was rebuilding a PSU for the 7220 and getting the resistors the wrong way round. You guessed it, I didn't check it and promptly delivered a whopping 12v+ to the 7220! It put up a good fight though! (briefly, before dying).
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Old 7th January 2012, 09:02 AM   #490
UV101 is offline UV101  England
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Remember the 7220 is responsible for all clock distribution when the player is standard so you will make significant improvements to the whole clocking just be using a decent reg on the 7220 (even in a standard player) the 1st mod I do is a reg on 7220!!!! ;-)
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