Harmon Kardon CDP mods please

ozziozzi · 29th June 2007, 09:38 AM

Can anyone point me towards a thread or website that details mods/tweaks/improvements for Harmon Kardon CD players, especially the HD 7300 that I have just acquired. I searched forum in vain.

Regards
Ozziozzzi

deuginthesky · 30th June 2007, 11:32 PM

Basics:
-filtering "self"
-bigger power caps bypassed by film caps
-faster diodes
-better resistors
-better op amps...

Works for any digital source.

ozziozzi · 2nd July 2007, 01:08 AM

Merci, deuginthesky, I will inquire locally about "better" quality components. I have heard that replacing switch-mode power supply with a well-regulated and filtered linear power supply is a good start--someone even suggested **battery** supplies for different parts of a CD player or increased decoupling of powersupplies on the boards themselves to prevent interaction between digital and analogue parts of circuit. I am trying to find a service manual or at least a circuit diagram for the HD7300.

Thanks again for your suggestions

Ozziozzi

deuginthesky · 7th July 2007, 08:48 PM

For example, what I did on a Pioneer CD-player:

10 000UF 50V main capacitor filtered by a 2,4UF MKP cap.
82 00UF Panasonic FC "secondary" capacitor
1% standard metal resistors between dac and outputs
ceramic bypass/coupling caps replaced by styroflex/mil grade PIO.
Elna Silmics II before outputs
MKP hi quality caps (Clarity Cap SA range) soldered on PCB/RCAs outputs
I/V OP amp is now LT1057
analog amp is now OPA2604
MKP bypass caps

Not that expensive when you buy lots of components

With good speakers, you hear the difference.

29th June 2007, 09:38 AM	#1
ozziozzi diyAudio Member Join Date: Jan 2006 Location: Canberra	Harmon Kardon CDP mods please Can anyone point me towards a thread or website that details mods/tweaks/improvements for Harmon Kardon CD players, especially the HD 7300 that I have just acquired. I searched forum in vain. Regards Ozziozzzi

2nd July 2007, 01:08 AM	#3
ozziozzi diyAudio Member Join Date: Jan 2006 Location: Canberra	Merci, deuginthesky, I will inquire locally about "better" quality components. I have heard that replacing switch-mode power supply with a well-regulated and filtered linear power supply is a good start--someone even suggested battery supplies for different parts of a CD player or increased decoupling of powersupplies on the boards themselves to prevent interaction between digital and analogue parts of circuit. I am trying to find a service manual or at least a circuit diagram for the HD7300. Thanks again for your suggestions Ozziozzi __________________ "If at first you don't succeed--what's new"

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30th June 2007, 11:32 PM	#2
deuginthesky diyAudio Member Join Date: Jan 2007 Location: europe	Basics: -filtering "self" -bigger power caps bypassed by film caps -faster diodes -better resistors -better op amps... Works for any digital source.

7th July 2007, 08:48 PM	#4
deuginthesky diyAudio Member Join Date: Jan 2007 Location: europe	For example, what I did on a Pioneer CD-player: 10 000UF 50V main capacitor filtered by a 2,4UF MKP cap. 82 00UF Panasonic FC "secondary" capacitor 1% standard metal resistors between dac and outputs ceramic bypass/coupling caps replaced by styroflex/mil grade PIO. Elna Silmics II before outputs MKP hi quality caps (Clarity Cap SA range) soldered on PCB/RCAs outputs I/V OP amp is now LT1057 analog amp is now OPA2604 MKP bypass caps Not that expensive when you buy lots of components With good speakers, you hear the difference.

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