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Old 11th February 2013, 09:46 PM   #11
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Join Date: Feb 2009
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, 06:05 PM   #12
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Join Date: Feb 2011
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 14th April 2013, 11:43 PM   #13
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Join Date: May 2010
Location: Florida
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, 05:40 AM   #14
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Join Date: Jan 2009
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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