How to mod a parasound hca 2200 mk2 ?

Søren Kramer · 29th March 2004, 07:37 AM

Any simple - and more radical - suggestions ? - John Curl ?

john curl · 29th March 2004, 04:05 PM

It has been a long while since I looked at the 2200. I loaned two units out (years ago), one to Jack Bybee; another to Brian Cheney (VMPS), and neither have been returned to me, so I haven't seen one in years.
However, this amp is a good candidate for modification.
First locate any bypass caps that seem 'tacked on' or paralleled with other similar caps. Just remove them, except for one 0.1 uf or so cap in each board location. Any bypasses across power electrolytics should be removed.
Second, make sure that your feedback resistors (47K) are 1/2W Resista or Holco (old), nothing else will do.
This should get you started.

Søren Kramer · 6th April 2004, 10:17 AM

Striking - and giving indsight
It did hurt to remove all the speed. But the sound is more pleasing, smooth, calm and delicious. It kind off changed the face of the amp. I like the "new" - better - sound. The amp sounds inviting just after you turned it on. I think it is a good sign.

Will you give an short explanation ? - so I can search more effectively - what is nessesary speed ?

The feedback resistors are Holco H4. I dont no if its the old style type ?

Do you have any more proposals ?

seakinggr · 11th February 2011, 07:00 PM

Hi I am new to this interesting forum, I recently purchased the HCA 2200 MkII, can you be more specific about the " caps that seem 'tacked on' or paralleled with other similar caps. Just remove them, except for one 0.1 uf or so cap in each board location" and what about the 47K resistors where are they, I am an electronic engineear my self so I think I can make some mods my self. Please also look at the attached pictures, can you tell me what is wrong with this resistors....
Thank you in advance.

p.s Sorry for my poor English but I am from Greece.

inspired · 14th November 2011, 02:07 PM

I found this very old thread as I am looking for an HCA-2200 II and figured someone here might have one available.

29th March 2004, 07:37 AM	#1
Søren Kramer diyAudio Member Join Date: Mar 2004 Location: Århus	How to mod a parasound hca 2200 mk2 ? Any simple - and more radical - suggestions ? - John Curl ?

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29th March 2004, 04:05 PM	#2
john curl diyAudio Member Join Date: Jul 2003 Location: berkeley ca	It has been a long while since I looked at the 2200. I loaned two units out (years ago), one to Jack Bybee; another to Brian Cheney (VMPS), and neither have been returned to me, so I haven't seen one in years. However, this amp is a good candidate for modification. First locate any bypass caps that seem 'tacked on' or paralleled with other similar caps. Just remove them, except for one 0.1 uf or so cap in each board location. Any bypasses across power electrolytics should be removed. Second, make sure that your feedback resistors (47K) are 1/2W Resista or Holco (old), nothing else will do. This should get you started.

6th April 2004, 10:17 AM	#3
Søren Kramer diyAudio Member Join Date: Mar 2004 Location: Århus	Striking - and giving indsight It did hurt to remove all the speed. But the sound is more pleasing, smooth, calm and delicious. It kind off changed the face of the amp. I like the "new" - better - sound. The amp sounds inviting just after you turned it on. I think it is a good sign. Will you give an short explanation ? - so I can search more effectively - what is nessesary speed ? The feedback resistors are Holco H4. I dont no if its the old style type ? Do you have any more proposals ?

14th November 2011, 02:07 PM	#5
inspired diyAudio Member Join Date: Jan 2009	I found this very old thread as I am looking for an HCA-2200 II and figured someone here might have one available.

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