MPSU05 and MPSU55 were used in later JC-2 production
http://db.audioasylum.com/cgi/m.mpl?forum=tweaks&n=35469&highlight=MPSU56&r=&session=
http://db.audioasylum.com/cgi/m.mpl?forum=tweaks&n=35469&highlight=MPSU56&r=&session=
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I say it is a very good option 
Why did you select those ZETEX
ZVN2110G / ZVP2110G ?
Are they the best for audio preamplifiers?
I am currently using these TO-92 MOSFET
ZVN3306A / ZVP3306A and ZVN3310A / ZVP3310A
... for some pre & headphones amplifiers I design and evaluate in MultiSim.
What are the main differences for 'my' compared to 'your' choice?
Thanks.
Why did you select those ZETEX
ZVN2110G / ZVP2110G ?
Are they the best for audio preamplifiers?
I am currently using these TO-92 MOSFET
ZVN3306A / ZVP3306A and ZVN3310A / ZVP3310A
... for some pre & headphones amplifiers I design and evaluate in MultiSim.
What are the main differences for 'my' compared to 'your' choice?
Thanks.
thanks John
Bigger but same.
A bit like the BC639/640 contra BD139/140 syndrome, I suppose.
I love you man. You are a rock to lean on in audio .. sometimes ...
The famous John Curl ... bothering with ordinary people from Sweden North (not far from arctic circle)
Amazing really.
We are one people.
Man to man .. born equal to be.
Each man of precise same value as another.
What say you are any more worth than a poor little boy born in India South East. Born to live in powerty and misery.
Nothing, in my point of view.
Finally,
I repeat my symphaty towards a man born John Curl
I love you.
Because you are my like. A human soul of mother produced.
Lineup - Sweden very north of - July hottest summer! = 24 degrees Celsius
* Anders Celsius .. in memorian
Bigger but same.
A bit like the BC639/640 contra BD139/140 syndrome, I suppose.
I love you man. You are a rock to lean on in audio .. sometimes ...
The famous John Curl ... bothering with ordinary people from Sweden North (not far from arctic circle)
Amazing really.
We are one people.
Man to man .. born equal to be.
Each man of precise same value as another.
What say you are any more worth than a poor little boy born in India South East. Born to live in powerty and misery.
Nothing, in my point of view.
Finally,
I repeat my symphaty towards a man born John Curl
I love you.
Because you are my like. A human soul of mother produced.
Lineup - Sweden very north of - July hottest summer! = 24 degrees Celsius
* Anders Celsius .. in memorian
john curl said:
Yeah. I often make analogy with a car engine .. for a transistor.
JFETs are a bit different, and I know John refers to them JFET.
I wish I could get me some 2SK170V & 2 SJ74V
But they are a bit rare
A group buy of 2SK170V + 2SJ74V Count me in!!!!
---------------------------------------
This following is about BIPOLAR transistors. Which DOES NOT have a Maximum IDDS = Current value!.
When we have a motor bike engine / car engine we have a gear box.
Even in John Curl class = Formula One.
Why?
Because the engine wouldnt work best at very high RPM.
In fact the best performance in somewhere in the middle of the RPM scale.
Say a Volvo Car Engine from my country of Sweden
- At 1.000 rpm it is a bit weak.
- At 5.000 rpm it is a bit weak.
- At 2.000-3.000 rpm it is the strongest.
Try to go uphill, and you will notice
Same in absolute Formula One for Hamilton from UK.
He will need to adjust to the this maximum gm of his engine.
All the time
If he hadnt gear box in car, he would find that he would prefer riding at those middle RPM.
This prevents the engine to become too hot & damage something.
But also it gives you most power output = great effectivness.
There is curve for this sweet spot .. in the center of RPM-Scale.
This goes for for BIPOLAR BJT Transistors, as well.
SAFE Operation Area (SOA) vs. Gain (HFE) Output.
Lineup
I am building the kit from tubeshunter.
As in the first post is remarked to be carefully about the output transistors orientation, I cared about all FETs and transistors orientation.
Now, I am quit confused, as the output transistors seems to be correct.
But not the FETs in the right channels input.
I am right?
The black lines in the second picture are showing the direct connections between the FETs.
Thanks for support.
Franz
As in the first post is remarked to be carefully about the output transistors orientation, I cared about all FETs and transistors orientation.
Now, I am quit confused, as the output transistors seems to be correct.
But not the FETs in the right channels input.
I am right?
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
The black lines in the second picture are showing the direct connections between the FETs.
Thanks for support.
Franz
john curl said:
Condescension - whatever that is for a no-english speaking man,
it sure isnt no good.
Artwork & Expression, in Words or Painting - 100 people look at it;
Not one will see the same as his brother/sister.
Because each mind is unique.
I have come to this conclusion, John, regarding your question if my words directed to your mind is this or that.
If is good or bad.
Your question indicates, that you do not trust me.
Because if you did wholeheartedly, you wouldnt ask.
You would understand my message to your soul. Instantly & intuitively.
No questions asked.
Bottomline. My earned experience of my own mind and others minds.
---------------------------------------------------------------------
Each posted message at this forum.
Each posted schematic, like JC-2 Original.
Each posted compliment or any personal behavior feedback.
Each attempt to convey a message across internet to other human.
Will be interpretated according to your own mnid.
Your unique and individual state of mind.
Any reaction you do, to anybody's message
any reply
will tell more about you & your self & your current relation/attitude to the poster
.. than it will tell anything about the original message sender.
Because, artwork or audio work published
has to pass a mind to perceived & interpretated.
Beauty is all in The Eye of The Beholder.
And so is ugliness, too.
Regards, John, John Curl.
I love you man & I Love your audio work.
You are one rock to lean on.
As
Seen through these subjective 2 Eyes of Mine
( they are green .. I am not BlueEyed and naiv no more )
Lineup, Top of Europe 2008 (very north of sweden)
Regarding the MPSW06/W56 - these are in the long T0-92 package, which is good for 1W at 25C, and probably more like 0.5-0.6W with derating for elevated ambient temperature. The Japanese use this long package for many of their low power driver transistors. I use them in situations where a normal TO-92 package won't cut it, but the power dissipation is still relatively low. Getting towards a Watt or so dissipation, I reach for something with a hole on it so I can bolt on a heat sink. I've put a home made heat sink on the TO-92L package, but it's a lot of trouble unless you really need to do it. In my case, I was running a matched pair of MPF960 mosfets as a differential input stage with a lot of bias current. I wanted the relatively small die for low (relatively speaking) input capacitance, and the long TO-92 package gave me more of a chance to get the heat out. If I did it again, I'd cascode the mosfets with something I could heat sink more easily.
