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MCA - Son of ZCA
http://diyaudioprojects.com/Forum/viewtopic.php?f=10&t=3942
Page 22 of 28

Author:  mwhouston [ 18 Sep 2016, 08:18 ]
Post subject:  Re: MCA - Son of ZCA

I think it is the second on this site anyhow.

Author:  max130 [ 18 Sep 2016, 08:52 ]
Post subject:  Re: MCA - Son of ZCA

Wow, thats making me proud :)
Firstly I have made a try on a piece of wood but got too much hum from the input.
After installing everything in a proper enclosure there is absolutely no hum (and i have very sensitive speakers).
The temperature is higher than with the ZCA: the enclosure gets approx. 50° Celsius.
The sound is much more direct, some sort of punchy. The best match to the Fostex i can imagine.
I have not heard a lot of that directly sounding systems even on HighEnd exhibitions.

I enjoy a lot!
Best regards
Stefan

Author:  mwhouston [ 18 Sep 2016, 09:07 ]
Post subject:  Re: MCA - Son of ZCA

Do yo have any way of determining the max power output prior to any distortion. Usually you would use CRO and look for the 1K sine wave to start to alter shape while driving an 8ohm resistor.

Author:  mwhouston [ 18 Sep 2016, 09:09 ]
Post subject:  Re: MCA - Son of ZCA

Yours is definitely the most pro looking. Do you have an image of the enclosure, lid on, front and back.

Author:  max130 [ 18 Sep 2016, 09:36 ]
Post subject:  Re: MCA - Son of ZCA

It is like i mostly do with speakers, at the moment it is "on line" i don't want to disattach anymore because i enjoy listening so much :)
So to measure the output power is a duty to do somewhen....
As well as the photo's with the lid on.
So please have mercy and give me a time to do that, will certainly take a week or so.

Author:  max130 [ 18 Sep 2016, 10:05 ]
Post subject:  Re: MCA - Son of ZCA

OK, a picture from the front is not too difficult
MCA is bottom left... ;)

Author:  Makjoe [ 18 Sep 2016, 15:38 ]
Post subject:  Re: MCA - Son of ZCA

Hello max130

Very very good job ,it looks nice and pro.

I show you my beta version , 8-) . I agree it sound better than ZCA in general but anyway the ZCA also I like much.

My MCA its less powerful than yours , mine have 16v of power supply , and the bulbs are feed with 10v approx. 700ma.

Regards

Author:  Makjoe [ 18 Sep 2016, 15:41 ]
Post subject:  Re: MCA - Son of ZCA

more pics

Author:  max130 [ 18 Sep 2016, 15:57 ]
Post subject:  Re: MCA - Son of ZCA

Hi Makjoe
Thank you very much for your compliment (also to Mark).
Apart from the fan (which i don't like so much) your unit looks very good also to me.
I like the lamps with their protective brackets.
Any photos of the inside by chance?

...and yes, the ZCA is very good as well.... But after having heard the MCA I have stored it away...

Best regards
Stefan

Author:  mwhouston [ 18 Sep 2016, 17:46 ]
Post subject:  Re: MCA - Son of ZCA

Makjo, that's different and your MCA must be, as with Stefan's, is one of three that I am aware of. This design came about by others building ZCAs and liking them and asking if I had any other ideas. From that came the MCA mainly because I wanted to make an amp with a bipolar transistor and not a FET. But for years no one ever built one and mine was only a "proof of concept". But now there are at least thee in the wild which I'm aware of.


The best part is you all seem to enjoy the sound and that is what it is all about. I'm yet to build one for myself but the day is coming. Also I'm thinking of an integrated version. So you might say a "MCIA" (you could pronounce it a "Mc-ear-a" - lol). What I'm thinking is a BoZ preamp section, then pot then a MCA power section. It maybe the one I build to prove that the idea works.

Thanks guys for going to the effort of putting a scetchy idea and a poor prototype to the test. Best part is all you get to enjoy the result. Thanks again.

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