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How to mod a parasound hca 2200 mk2 ?
How to mod a parasound hca 2200 mk2 ?
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Old 11th February 2013, 10:46 PM   #11
dude2010 is offline dude2010  Denmark
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If i compare soundstages with my Doxa 73 signature, the doxa is perhaps 2 or even 3 times bigger, having a bandwith over 1Mhz. Is that just the way life is, or do it need service? Wrong bias or what ever?
Cooling fins differ 5-6 deg. celcius..
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Old 10th March 2013, 07:05 PM   #12
seakinggr is offline seakinggr
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Originally Posted by john curl View Post
Vacuum it out first! Clean the contacts, both input and output. Finally, if you see a lot of 'extra' film caps across the main power caps, you can cut the majority of them out.
Thank you very much for the reply, I found the schematic online and from my understanding one must remove the film caps that are parallel to the main power caps, but the majority?? how many do I leave in place?? and an other thought if we decrease the value of the feedback resistors (47K) wouldn't the frequency response be increased ?? also does it mutters if the Holco is higher wattage (from my understanding no).
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Old 15th April 2013, 12:43 AM   #13
embrown057 is offline embrown057  United States
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Default MKII

wattage for the 47k makes no difference (1w) say, I believe John was suggesting the H2 version. I just order the 47K from Texas Components. Changing the feedback value is not a good idea, tried it and did not get good results but you can do whatever you like. I would just remove the bypass polystyrene's and leave one for each. As far as the power supply bypass I found it best to add all the values that are in place and install one high quality polypropylene. I get very good results with the multicap PPMFX or better. I would take a really good look at the ripple under a load and make sure you main caps are still good. I have not seen a single one of the Richie caps they used in good shape. Element 14 has the a great CD cap. I usually use the 22,000uf 80v. Fitting in larger caps are not a option or at least it's more of a mess to fit and make no difference.
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Old 16th August 2013, 06:40 AM   #14
kenwood61 is offline kenwood61  United States
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Default HCA-2200, not the 2200ii

Hello, sorry if I missed this, but I didn't see any comments about the earlier version of the 2200. That's what I have. But it sounds like the values aren't exactly the same . . .

The bypass clusters on the main filter caps are comprised of 3 large white block .1k 200V caps, and a smaller white block cap that is .01k 400(V) . . . with 6 yellow .01K100 Full PS caps in parallel.

A buddy was fixing the same model that I have, and he told me that the unit he is working on had the bypass "clusters" removed. There was no cap left, or put in the place. So I marked the +/- and location of each cluster before removing, and the amp seems to work fine. I "think" it sounds better, but I haven't listened to it enough.

I'm wondering if there is any "danger" in leaving the amp this way.
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Old 27th February 2015, 01:11 AM   #15
HemiRick is offline HemiRick  United States
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I would also like to know the answer to Kenwood61's question about the clusters in the series 1....Also does anyone know what changes were made between series 1 and 2 2200's, I read the 2's have 100,000uF caps in the PS and I know my 1 has 25,000. In short what series 2 mods can be applied to a series 1?
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Old 17th October 2015, 11:07 PM   #16
Tonybo is offline Tonybo
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Discovered a simple but worthwhile renovation mod on my 2200ii, thought someone might benefit from this. I had noticed my power switch was deteriorating badly. When I took it apart I found badly burned contacts but also realised that it had a spare pair of contacts which are completely unused. Just move the lower pair of spade connectors onto the upper (unused) spades on the back of the switch and you effectively have a brand new switch. I had to put the damned thing back together again, so it wasn't quite so simple for me..
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Old 18th October 2015, 01:04 PM   #17
sgrossklass is offline sgrossklass  Germany
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If you've got a problem like that, look where the spark killer cap for the switch is - probably some way off. Solder that directly to the switch or at least as close as you can get.
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Old 19th October 2015, 08:23 AM   #18
Tonybo is offline Tonybo
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Thanks, I don't see the cap on the circuit diagram though. If the problem persists then it could be the thing to do, what value would you use?
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Old 26th March 2017, 01:26 PM   #19
seakinggr is offline seakinggr
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Hello to all,
I want to share some mods / restoration I did to my beloved Parasound HCA 2200 MKII, please follow the link below.

whatishifi: Restoring and modifing a Parasound HCA-2200II power amp.

The results are amazing :-)
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Old 22nd June 2017, 10:25 AM   #20
tiefbassuebertr is offline tiefbassuebertr  Germany
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Location: D-55629 Schwarzerden
a friend of me want to enhance the input sensitivity (voltage gain factor) for approximately +6 db (MK-II version).
Is it possible to change the NFB resistors for higher voltage gain in the front end?

On a second device of the same model my friend want to perform a modify to get a "Unity Gain" unit in such a way, that such a variation arises like the cool follower from Andrea Ciuffoli - go to
The main issue on this topology is the bad value for the so called power supply rejection ratio (PSRR).

Thank you for your advices.

Last edited by tiefbassuebertr; 22nd June 2017 at 10:39 AM.
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