Marantz CD63 & CD67 mods list - Page 151

poynton · 24th March 2006, 08:19 PM

Hi.

Ideally, ferrites / chokes should be positioned right next to the chip. [ minimum distance ]

Andy

ash_dac · 24th March 2006, 08:20 PM

Quote:

Originally posted by poynton
Hi.

Ideally, ferrites / chokes should be positioned right next to the chip. [ minimum distance ]

Andy

Is that your cd63 on ebay ?

poynton · 24th March 2006, 08:25 PM

two of the many !!!!!

I still have 6 left plus the '43, '53 and the numerous CD60, Seimens RA400, Kenwoods, CD303. CD104s, cd304 [1+2] etc

Oh, I forgot - the CD4000 and the 2 B&O CD-X

you can't move in my garage !

ash_dac · 24th March 2006, 08:36 PM

Quote:

Originally posted by poynton
two of the many !!!!!

I still have 6 left plus the '43, '53 and the numerous CD60, Seimens RA400, Kenwoods, CD303. CD104s, cd304 [1+2] etc

..and the cdm1 mech's

poynton · 24th March 2006, 08:39 PM

Quote:

Originally posted by ash_dac

..and the cdm1 mech's

Didn't I mention the CDM's ? or the CD204?

ash_dac · 24th March 2006, 11:29 PM

Hi,

Would it be possible to feed the PWM outputs into a half-bridge amplifier MOSFET stage, and LPF ?

Then I wouldn't need an amp !

http://users.ece.gatech.edu/~mleach/...01/ClassD2.pdf

Or have I had too many beers!

poynton · 25th March 2006, 10:32 AM

Quote:

Originally posted by ash_dac
Hi,

Would it be possible to feed the PWM outputs into a half-bridge amplifier MOSFET stage, and LPF ?

Then I wouldn't need an amp !

http://users.ece.gatech.edu/~mleach/...01/ClassD2.pdf

Or have I had too many beers!

Hi.

Since the balanced inpt power amp is essentially the same as a balanced input op-amp, the answer is a [ guarded ] YES !

How about incorporating a T-AMP or TDA1554 and psu inside the chassis?

Andy

ash_dac · 25th March 2006, 12:08 PM

Quote:

Originally posted by poynton

Hi.

Since the balanced inpt power amp is essentially the same as a balanced input op-amp, the answer is a [ guarded ] YES !

How about incorporating a T-AMP or TDA1554 and psu inside the chassis?

Andy

Hmm. Thanks Andy.

TDA1554 looks interesting, and is quite cheap. [url]

If I added sockets in the Marantz and it all went wrong I could put the old op amps back in.

T-AMP- might get one of them since I got paid today.

Fidelity Audio · 29th March 2006, 12:56 PM

FAO RAY......

Ray as you know I have the OPA627 and OPA132 combo on browndogs.

I have not done any bypassing on them yet. And now is the time lol

I have the two Audiocom super regs directly on the op amps and 4 Black Gate FK 16V 470uF caps.

The noise should be pretty low, so do you still recommend I need bypassing on the opamp pcb?

I was looking at using BG FK 16V 33uf or 47uF caps or do you recommend a different value you have found works better.

Also something like a 220nF film resistor to decouple + and - 12V, is this also advantagous.

cheers

Brent

philpoole · 29th March 2006, 01:16 PM

Hi Brent,

How close are you going to put these caps to the opamps?
Can you get them on the browndogs?

Cheers,
Phil

24th March 2006, 08:19 PM	#1501
poynton Magneto the Gravity Man diyAudio Member Join Date: Mar 2005 Location: A life on the ocean waves when I'm not at home in N. Wales (but I'm not Welsh so no sheep jokes!)	Ferrites Hi. Ideally, ferrites / chokes should be positioned right next to the chip. [ minimum distance ] Andy

24th March 2006, 11:29 PM	#1506
ash_dac diyAudio Member Join Date: Jan 2005 Location: UK	Use the PWM outputs? Hi, Would it be possible to feed the PWM outputs into a half-bridge amplifier MOSFET stage, and LPF ? Then I wouldn't need an amp ! http://users.ece.gatech.edu/~mleach/...01/ClassD2.pdf Or have I had too many beers!

29th March 2006, 12:56 PM	#1509
Fidelity Audio diyAudio Member Join Date: Dec 2005 Location: Doncaster England	FAO RAY...... Ray as you know I have the OPA627 and OPA132 combo on browndogs. I have not done any bypassing on them yet. And now is the time lol I have the two Audiocom super regs directly on the op amps and 4 Black Gate FK 16V 470uF caps. The noise should be pretty low, so do you still recommend I need bypassing on the opamp pcb? I was looking at using BG FK 16V 33uf or 47uF caps or do you recommend a different value you have found works better. Also something like a 220nF film resistor to decouple + and - 12V, is this also advantagous. cheers Brent __________________ Fidelity Audio - Home of quality products & upgrades - What HiFi 5 Star Headphone amp » Hifi World 5 Star Pre amp » HiFi Choice 5 Star Group test winner HPA-100

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24th March 2006, 08:25 PM	#1503
poynton Magneto the Gravity Man diyAudio Member Join Date: Mar 2005 Location: A life on the ocean waves when I'm not at home in N. Wales (but I'm not Welsh so no sheep jokes!)	two of the many !!!!! I still have 6 left plus the '43, '53 and the numerous CD60, Seimens RA400, Kenwoods, CD303. CD104s, cd304 [1+2] etc Oh, I forgot - the CD4000 and the 2 B&O CD-X you can't move in my garage !

29th March 2006, 01:16 PM	#1510
philpoole diyAudio Member Join Date: Oct 2004	Hi Brent, How close are you going to put these caps to the opamps? Can you get them on the browndogs? Cheers, Phil

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