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VSSA Lateral MosFet Amplifier

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#741
Renioo said:
Would there be a possibility you could attach the SMD parts? They are pretty expensive if you buy them individually in such a low amount... and I'm not the only one having this problem. Attaching them to PCB's would be great 🙂
Click to expand...

Guys what are we, DIY-ers or what? :smash:

Are we afraid those little parts called SMD? :magnify:

Aren't you all wanted to try something completely new some day? :trapper:

Here in VSSA thread you get guided and supported tour. Trust me I'll follow you all the way to the finished product, like in a Lord of the Rings journey. At the end you'll be proud on yourself and happy to make a wonderful little high tech linear amplifier. :happy1:

Regards Andrej :up:
 

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#745
RayCtech said:
The obvious reason why it sounds better are the fact that the output transistors are outside the feedback loop...
So long the output transistors run class A this is a very good solution.
But it the output switches to class B the output impedance will be doubled and high levels of THD will be the result..
Click to expand...

Guys, can you please discuss in some other thread, this is completely offtopic, since this is VSSA thread and we have more than enough intopic posts. :up:
BTW outputs are in GFB loop. 😉
 
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#747
Lazy Cat said:
Guys, can you please discuss in some other thread, this is completely offtopic, since this is VSSA thread and we have more than enough intopic posts. :up:
BTW outputs are in GFB loop. 😉
Click to expand...

Hello
Andrej that mean you can't ad me to the GB for a pair Power mosfet??
Unfortunately not available at any store at the moment and may be no longer will be. Probably when you order 400-500PC or more you get it from ALFET..
Please help me with these issue, I don't think these much off from the topic.😀
Just imagine if you were in my shoes, would you like to get some help, specially after I designed (work on) the PC board layout hours..
Thank you🙂
Greetings Gabor
 
#749
Lazy Cat said:
Guys what are we, DIY-ers or what? :smash:

Are we afraid those little parts called SMD? :magnify:

Aren't you all wanted to try something completely new some day? :trapper:

Here in VSSA thread you get guided and supported tour. Trust me I'll follow you all the way to the finished product, like in a Lord of the Rings journey. At the end you'll be proud on yourself and happy to make a wonderful little high tech linear amplifier. :happy1:

Regards Andrej :up:
Click to expand...

Oh I think you misunderstood me 😀 I suggest you can supply every kit of PCBs (or just for those who wants it, doesnt matter) with all necessary SMD parts, so we would have everything to assemble it 😀
 
#750
gaborbela said:
Hello Andrej

What good would do to me to order your PC board (actually to be honest is very nice and supper quality) if I don't use SMD parts???😕
When I write I want to compare the two amplifier that is for me to learn not to publish the result or any other opinion.
Or promote my amplifier!!!!!!:smash:
Only to you in PM if you would interested I promise🙂!
Why I do not use SMD parts?
I do believe in the regular exotic part quality still better and I got used to certain type of resisters like Caddock, PRP and silver solders ( high temp melting because lead free).
I do have at home 4 spool different type ( some of them $65 a spool) solder.
PLEASE DO NOT SAY SOLDER IS SOLDER because we tested!
Even so called non "audiophile" guy can her the difference when we did A-B test.
Please guys again I do not want to argue over the parts quality etc... That is another topic...
I do have my own experience, you have your own and I respect that!
Andrej please help me so I can get a pair power mosfet (may be they do not sell only 2PC to me)!
Here I ask a favour with a lot of respect to your result about these amplifier!
Just remember when someone posted here some circuit from my thread I did ask for the removal, again I do respect your achievement, your project!!!😀

Greetings Gabor
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gaborbela said:
Here I want to get some idea about LC how much he improved these topology, that is all.
After I can test your resister , PC boards etc!
I hope you understand my point.

Greetings Gabor
Click to expand...

Hi Gabor :wave:

First of all thanks for all kind words, really appreciate your spirit and fondness to this topology. Since I know how much it means to you I'll definitely provide you two ALF as soon as I'll get them. You'll be able to make all the listening tests and if ALFs will sense you a taste to go even further you can get VSSA PCBs as well, anytime. But for now we all have to wait the new series will be produced in Semelab. I ordered 300 pcs so for the first GB quantity will suffice what's then depends on members opinions after burn in period.
So please be in touch and follow the thread. When I get those double mosfets I'll sing a song here hehe. :sing:

Best regards to you and all present, Andrej :cheers:
 
#751
Lazy Cat said:
Hi Gabor :wave:

First of all thanks for all kind words, really appreciate your spirit and fondness to this topology. Since I know how much it means to you I'll definitely provide you two ALF as soon as I'll get them. You'll be able to make all the listening tests and if ALFs will sense you a taste to go even further you can get VSSA PCBs as well, anytime. But for now we all have to wait the new series will be produced in Semelab. I ordered 300 pcs so for the first GB quantity will suffice what's then depends on members opinions after burn in period.
So please be in touch and follow the thread. When I get those double mosfets I'll sing a song here hehe. :sing:

Best regards to you and all present, Andrej :cheers:
Click to expand...

Semelab is not a backyard company. But money is money and if they can't earn money on the parts they will discontinue them.

The only right way todo is like Andrej... To order a fairly large amount.

As soon as the datasheet is more complete i will maybe order them as well. So dont be afraid not to be able to repair.
 
#752
Hi Sony

Yes I think the same as you, no problem or worries about the producer, only they heve to get the right signal from the market that device is wanted and they'll definitely provide them. It's a start with this little double mosfet, but I tell you it is very very good part, very rougged and precise soundwise. I torture them every single day here and they just singing hehe. Also paralleling them in a scaled up VSSA model would make us all very pleased some day. :cloud9:
 
#754
Lazy Cat said:
Hi Sony

Yes I think the same as you, no problem or worries about the producer, only they heve to get the right signal from the market that device is wanted and they'll definitely provide them. It's a start with this little double mosfet, but I tell you it is very very good part, very rougged and precise soundwise. I torture them every single day here and they just singing hehe. Also paralleling them in a scaled up VSSA model would make us all very pleased some day. :cloud9:
Click to expand...

Have you tried at low idle current (20 - 40mA)?
 
#755
juma said:
I did a JFET input version of this amp few years ago when I wanted to incorporate LATFETs into F5 (adding them as a Source Follower output stage to F5 topology).
Input stage biasing is easier (JFETs being depletion mode devices) and input impedance is much higher.
It sounded OK but I liked this one more...

Anyway, here is the JFET input, BJT VAS and LATFET output version (the forum member "fab" built something similar before me) of this amp:
Click to expand...
Hi Juma
I also prefer your version (over the one you showed) with MOSFET vas. In fact , I just built an hybrid version having Vssa input bjt , MOSFET vas and lateral MOSFET and it sounds quite nice (to my ears)....

Fab
 
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#758
how about we open a new paralel VSSA thread for this debate ????

or even better ....debate could continue here, where it started
and VSSA builders could continue in fresh new VSSA thread ???? ....I think that would be optimal :scratch2:
 
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