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 Post subject: Re: MCA - Son of ZCA
PostPosted: 15 May 2020, 07:40 
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Joined: 14 May 2020, 01:02
Posts: 2
Hi,

the ZCA has 4.8W
After reading the whole thread i found no information how much the MCA has. Please can someone tell me how much Watt the MCA has?


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 Post subject: Re: MCA - Son of ZCA
PostPosted: 15 May 2020, 07:44 
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Joined: 14 May 2020, 01:02
Posts: 2
Hi,

after reading the hole thread i found no information how much Watt the MCA has on output. Please can someone tell me (i know the ZCA has 4.8W)


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 Post subject: Re: MCA - Son of ZCA
PostPosted: 17 May 2020, 18:06 
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Joined: 06 Jun 2008, 18:23
Posts: 5318
Location: Australia
ta-bert wrote:
Hi,

after reading the hole thread i found no information how much Watt the MCA has on output. Please can someone tell me (i know the ZCA has 4.8W)

I have no actual imperial figure but no more than 5W maybe even as low as 2W.

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Projects: “Mantra” - tube MM phono preamp | "Carbon” - MM phono preamp | 180W RAW Class D amp | "Illusion" - 6SN7 SRPP preamp in a plastic jiffy box |


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 Post subject: Re: MCA - Son of ZCA
PostPosted: 30 Jun 2020, 13:43 
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Joined: 09 Apr 2013, 02:59
Posts: 50
Location: Germany
mwhouston wrote:
max130 wrote:
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


Do you still use your MCA? That looked a really good build.

Yes, I am very happy with it. It is still running unchanged since my last post without any problem.

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...three turntables are hardly enough...


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 Post subject: Re: MCA - Son of ZCA
PostPosted: 30 Jun 2020, 13:45 
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Joined: 09 Apr 2013, 02:59
Posts: 50
Location: Germany
mwhouston wrote:
ta-bert wrote:
Hi,

after reading the hole thread i found no information how much Watt the MCA has on output. Please can someone tell me (i know the ZCA has 4.8W)

I have no actual imperial figure but no more than 5W maybe even as low as 2W.


My MCA is providing pretty precisely 1 W.
Which is by far enough for my back loaded Fostex horns.

_________________
...three turntables are hardly enough...


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 Post subject: Re: MCA - Son of ZCA
PostPosted: 30 Jun 2020, 18:46 
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Project Author
User avatar

Joined: 06 Jun 2008, 18:23
Posts: 5318
Location: Australia
max130 wrote:
mwhouston wrote:
max130 wrote:
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


Do you still use your MCA? That looked a really good build.

Yes, I am very happy with it. It is still running unchanged since my last post without any problem.

Good to hear.

_________________
Projects: “Mantra” - tube MM phono preamp | "Carbon” - MM phono preamp | 180W RAW Class D amp | "Illusion" - 6SN7 SRPP preamp in a plastic jiffy box |


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 Post subject: Re: MCA - Son of ZCA
PostPosted: 16 Nov 2020, 06:01 
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Joined: 24 Feb 2020, 04:54
Posts: 3
Hi Mark.
Its been quite many years but your device still draws attention, as you see.
Thanks a lot for this brilliant little amp. It sounds sweet and balanced for such a small circuit. Easily drives my DM601s. I really enjoy it.
Wanted to add my photos. I put the PS in a separate box. This in the picture is the amp that was built in a 12cmx12cm aluminum box that used to be the heatsink of an oil-cooled vacuum pump. It worked like charm as both the housing and heatsink in this project.


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 Post subject: Re: MCA - Son of ZCA
PostPosted: 16 Nov 2020, 22:23 
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Joined: 06 Jun 2008, 18:23
Posts: 5318
Location: Australia
Dies look unusual but so is the cct. Glad you like it. Got more images. What about a clear one of the inside.

_________________
Projects: “Mantra” - tube MM phono preamp | "Carbon” - MM phono preamp | 180W RAW Class D amp | "Illusion" - 6SN7 SRPP preamp in a plastic jiffy box |


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 Post subject: Re: MCA - Son of ZCA
PostPosted: 16 Nov 2020, 22:25 
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Project Author
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Joined: 06 Jun 2008, 18:23
Posts: 5318
Location: Australia
How efficient are your speakers. Have an image of them or a link.

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Projects: “Mantra” - tube MM phono preamp | "Carbon” - MM phono preamp | 180W RAW Class D amp | "Illusion" - 6SN7 SRPP preamp in a plastic jiffy box |


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 Post subject: Re: MCA - Son of ZCA
PostPosted: 01 Dec 2020, 06:34 
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Joined: 24 Feb 2020, 04:54
Posts: 3
Here are more photos. Not the best ones because I did not want to detach the cables as it was not so easy work in a cube with only one wall open.
Power tubes are C5200s, screwed to two opposite walls, thus also holding the circuit hanging in place. Big resistors are installed to the bottom of the box.
Speakers are B&W DM601S3. I added a photo showing specs.
I have used a Focusrite Scarlett solo that acts as a soundcard/preamp from computer to the ZCA.


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