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 Post subject: Re: MCA - Son of ZCA
PostPosted: 23 Feb 2015, 13:34 
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Joined: 20 Feb 2015, 21:22
Posts: 21
Location: Central Scotland, UK
Thanks Mark.

Unfortunately the 2sk1058 turned out to be a fake, so it looks like I'm going try out the MCA first as I have the 2n3055 already, though I'll be using a different jfet, will see how it goes and report back.

Not sure where this question belongs, so I'll just ask here: How well do you think you can judge distortion without access to any costly THD analyzer, 'scope or by ear?


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 Post subject: Re: MCA - Son of ZCA
PostPosted: 23 Feb 2015, 19:13 
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Joined: 06 Jun 2008, 18:23
Posts: 5126
Location: Australia
gasboss775 wrote:
Thanks Mark.

Unfortunately the 2sk1058 turned out to be a fake, so it looks like I'm going try out the MCA first as I have the 2n3055 already, though I'll be using a different jfet, will see how it goes and report back.

Not sure where this question belongs, so I'll just ask here: How well do you think you can judge distortion without access to any costly THD analyzer, 'scope or by ear?

Every system has distortion, pick the distortion you like best and stay with it. If it sounds good, it is good. Perception is reality.

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Projects:"retro2308" - chip based headphone amp | ”Calibre 834” - tube phono MM preamp | ”najah” - Raw 180W Tripath Class D power amp | "Icon" - Shuguang CV-181Z preamp


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 Post subject: Re: MCA - Son of ZCA
PostPosted: 23 Feb 2015, 20:00 
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Joined: 20 Feb 2015, 21:22
Posts: 21
Location: Central Scotland, UK
mwhouston wrote:
Every system has distortion, pick the distortion you like best and stay with it. If it sounds good, it is good. Perception is reality.


Yet there seems to be this quest for some sort of distortionless ultimate reality. :confused:

At the suggestion from a member of diyaudio.com I will be trying the 2n5458 instead of the 2sk170, though I have found a source for the 2sk170; http://www.cricklewoodelectronics.com ( They are based in London and have been around for years ), will order some 2sk170's from them at the end of the week, along with the 2sk1085.


Some pictures of the big heatsink I'll be using, the second one shows the rogue 2sk1058 attached:


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 Post subject: Re: MCA - Son of ZCA
PostPosted: 28 Feb 2015, 11:54 
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Joined: 20 Feb 2015, 21:22
Posts: 21
Location: Central Scotland, UK
Update on my MCA project:

I now have obtained the 2sk170 transistors, however in the meantime I threw toghether my own Minimal Component Amplifier, see here:

http://diyaudioprojects.com/Forum/viewtopic.php?f=10&t=5122

I will be trying out Marks MCA soon, I've also managed to get what appears to be a genuine 2sk1058 ( from: http://www.cricklewoodelectronics.com they are in London, uk, they also supplied the 2sk170's.)


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 Post subject: Re: MCA - Son of ZCA
PostPosted: 05 Mar 2015, 19:33 
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Joined: 10 Jun 2013, 08:36
Posts: 2
Hi guys, just a question about the power supply. If i ușe a 2.25 mH choke is it ok? I donț have a 10 mH one. Or maybe add some more wire...


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 Post subject: Re: MCA - Son of ZCA
PostPosted: 06 Mar 2015, 03:00 
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Location: Australia
Bibiku wrote:
Hi guys, just a question about the power supply. If i ușe a 2.25 mH choke is it ok? I donț have a 10 mH one. Or maybe add some more wire...

Great go for it.

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Projects:"retro2308" - chip based headphone amp | ”Calibre 834” - tube phono MM preamp | ”najah” - Raw 180W Tripath Class D power amp | "Icon" - Shuguang CV-181Z preamp


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 Post subject: Re: MCA - Son of ZCA
PostPosted: 08 Mar 2015, 14:50 
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Joined: 10 Jun 2013, 08:36
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One more question, just to be sure.. If i ușe 4 ohm loads will there be problems? I have 2 full range 6w speakers from like 1980 that sound great and i really want to use them with this amp.
Thank You .


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 Post subject: Re: MCA - Son of ZCA
PostPosted: 08 Mar 2015, 19:10 
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Location: Australia
Bibiku wrote:
One more question, just to be sure.. If i ușe 4 ohm loads will there be problems? I have 2 full range 6w speakers from like 1980 that sound great and i really want to use them with this amp.
Thank You .

8 would be better but try and see how it sounds. You may get some clipping earlier that's all.

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Projects:"retro2308" - chip based headphone amp | ”Calibre 834” - tube phono MM preamp | ”najah” - Raw 180W Tripath Class D power amp | "Icon" - Shuguang CV-181Z preamp


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 Post subject: Re: MCA - Son of ZCA
PostPosted: 25 Jun 2015, 12:46 
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Joined: 19 Jun 2009, 11:39
Posts: 1
My MCA finished


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 Post subject: Re: MCA - Son of ZCA
PostPosted: 11 Jul 2015, 13:49 
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Joined: 26 Dec 2013, 13:26
Posts: 18
: nice :beerchug:


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