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MCA - Son of ZCA
http://diyaudioprojects.com/Forum/viewtopic.php?f=10&t=3942
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Author:  Makjoe [ 14 Aug 2015, 09:57 ]
Post subject:  Re: MCA - Son of ZCA

Great Feniks :thumbsup: , I have one ZCA now go to MCA ... 8-)

Author:  max130 [ 07 Sep 2016, 12:50 ]
Post subject:  Re: MCA - Son of ZCA

Hi all
Just finished my MCA after been very pleased with the ZCA (with Fostex FE206E back loaded horns).

I have to say, the MCA is sounding incredible good, a very good step over the ZCA.

Bass is extremly fast.
The amp (driving the Fostex horns) is merciless to bad recordings even when just a little overmodulated.
Musical details are easily perceptible even in complex tracks.
But while xraying the music it is still playing musically.
I had never thought that amps make such a big difference.
Pictures will follow

Stefan

Author:  Peter W. [ 07 Sep 2016, 13:18 ]
Post subject:  Re: MCA - Son of ZCA

Funny thing.... I am gradually taking all my 3055 based amps out of service, and upgrading (and re-biasing) them for the 2N3772. I find today's 2N3055s so wildly variable that some read as "Germanium NPN" on my screening tester. So far, I have done no less than four Dynaco 80/120 TIP mods, as well as my AR Receiver and Amplifier - all with excellent results. This includes more stability, cooler running (MUCH cooler in the case of the AR items) and a bit more power before clipping.

On the other hand, the 2N3055 was used by SO MANY devices back in the day, including Fisher, Scott, AR, Revox, B&O and a number of others that it deserves respect. But, given how many of these same devices blew up by the numbers, I just don't trust it.

Author:  mwhouston [ 10 Sep 2016, 19:51 ]
Post subject:  Re: MCA - Son of ZCA

max130 wrote:
Hi all
Just finished my MCA after been very pleased with the ZCA (with Fostex FE206E back loaded horns).

I have to say, the MCA is sounding incredible good, a very good step over the ZCA.

Bass is extremly fast.
The amp (driving the Fostex horns) is merciless to bad recordings even when just a little overmodulated.
Musical details are easily perceptible even in complex tracks.
But while xraying the music it is still playing musically.
I had never thought that amps make such a big difference.
Pictures will follow

Stefan

Any images

Author:  max130 [ 12 Sep 2016, 12:47 ]
Post subject:  Re: MCA - Son of ZCA

...as soon i am back from business travel. :)

Author:  max130 [ 18 Sep 2016, 06:30 ]
Post subject:  Re: MCA - Son of ZCA

Here we go:

Author:  mwhouston [ 18 Sep 2016, 06:48 ]
Post subject:  Re: MCA - Son of ZCA

Look'n good. What is the current rating of the Hammond choked?

Author:  mwhouston [ 18 Sep 2016, 06:52 ]
Post subject:  Re: MCA - Son of ZCA

Did you change the input cap to 0.1uf?

Author:  max130 [ 18 Sep 2016, 07:06 ]
Post subject:  Re: MCA - Son of ZCA

The rating of the choces is 5A, have 2 in series.
Yes, the input cap is 0.1 uF.
And i have not the 100K resistor over input to earth.

regards
Stefan

Author:  mwhouston [ 18 Sep 2016, 07:54 ]
Post subject:  Re: MCA - Son of ZCA

Stefan, yours is either the second or possibly the first MCA ever built which I know of. Looks execellent and tell us more about the sound.

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