I only speak Norwegian. I understand political. But what is correctnezzez? 
that's not exactly in fashion nowadays, everything being about me too and political correctness
There must be a NP amp design using 2N3055?
https://dk.farnell.com/c/semiconduc...on-transistors-bjt?st=2n3055&showResults=true
They are still available in TO-3 package.
Who can make the best sounding 2N3055 amp? ......I think.....not me......
https://dk.farnell.com/c/semiconduc...on-transistors-bjt?st=2n3055&showResults=true
They are still available in TO-3 package.
Who can make the best sounding 2N3055 amp? ......I think.....not me......
Andy, check out the PDF in the first post here:
https://www.diyaudio.com/community/threads/baf-2022-sit-amps.391430/
It has a little tutorial for how tubes work and how SS parts work and how the Sony and Tokin parts are different from traditional SS parts.
The VFET amps are simplicity themselves. It is probably easier to build and has fewer parts than a DHT amp or preamp. You can do a lot of experimenting with it.
Tubes and DHTs are rare, have been out of production, only a few reliable sources make them today, and the best ones are expensive as heck. Is this situation any different than the best SS parts? I designed a SS triode preamp because I was tired of hitting up ebay to look for 10Y tubes. They are expensive, rare, and you don't know what you are going to get.
If you want simplicity, Class A, and no feedback, this is the place to be. The F7 and other F's are commercially successful designs that Nelson has kindly shared with us. The parts are available from the diyaudiostore. So, there is no problem to build it at all. In fact, Nelson and a lot of other folks here have worked hard to make these resources available to us.
@jean-paul, nobody is forcing you to build these amps. This is one way to do things and there are a million other ways. To come here and complain that these parts are obsolete, which is not true in itself as has been pointed out several times, seems like sour grapes to me. You are free to go ahead and design your own amp using whatever parts you like and share it with the community. You never have to look at a 2sk170 again. Sharing and enjoying DIY is what this is about. Let's keep it in that spirit.
Is that from an actual amp? Sony made an AV receiver with "naked" mosfets a few years back
So the "concept" actual exists?
I think the 2N3055 where the top is cut off if for educational purpose only 🙂
I think the 2N3055 where the top is cut off if for educational purpose only 🙂
Interesting.....so they get shorter signal path that way. One should think that traditional SMD gives short enough signal path.
The above open 2N3055.....when you look at how the copper connection is connected to the two pins.......you would like to solder it to ensure proper contact?
It is probably good enough "as is".
The above open 2N3055.....when you look at how the copper connection is connected to the two pins.......you would like to solder it to ensure proper contact?
It is probably good enough "as is".
ra7, please do not repeat what someone else said to be my words. You can easily read what I did write.
Apparently there was some truth in it 🙂
Apparently there was some truth in it 🙂
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I believe the shortened signal path comes from molecular bonding the pins. So the FET's pins and the traces they are connected to, act as one conductor. Eliminating the joints from pin to FET and pin to board.
I wonder if it is just a SONY "marketing stunt" or it has a real audio related value?
The use on PC-motherboards is because they have to "fight" speed-of-light as the limiting factor. Not so much in audio?
The use on PC-motherboards is because they have to "fight" speed-of-light as the limiting factor. Not so much in audio?
FWIW IMO Generally speaking if one asks a simple question and instead of a logical answer he gets a raise of shields my instinct suggests that it is often a kind of alarm bell.
However, I'm the last person wanting to tell another person if something is right or wrong, but IME if one loses logic it generally happens for two reasons: a reason of heart or a different one.
And of course I don't want to get in the middle of neither one nor the other,
I'm really very relaxed in saying this. 🙂
Take care.
To me it looks like a usual product differentiation strategy. Point to a possible 'problem' and offer a 'solution'.
From their paper: „In this way, Sony keeps signal leads to a minimum, protecting the music from the
radiation of spurious hum and noise. “
It would help if actual noise measurements were made for comparison with standard amplifiers. Compared to other PCB signal tracks lengths, semiconductor pins lengths are insignificant.
Eh, no. Andy did get useful answer on his question.
Argument has arisen because of opinion that it is wrong to publish any new designs with obsolete Toshiba parts. Frequent visitors of this forum section obviously think different. 😀
So, this argument is pointless or better suited for the longue section.
It seems that your description of the world must be the objective description of the world. 🙂
If you like it like this, then it will please me too just because I don't want it to become a controversy. 😉
However, JFIY I was referring to my question.
If you like it like this, then it will please me too just because I don't want it to become a controversy. 😉
However, JFIY I was referring to my question.
Since I'm Andy I can answer this. Yes, I have got a number of useful answers to the question. Probably the most useful was the M2x and the Front End. It took a number of posts to get that information, but it was there all the time.
I don't buy the argument about "frequent visitors" or that I "wandered in". I've been following the Pass designs on this forum and making frequent notes for the last year or so, ready for building an F7 which should happen shortly. I have a spare enclosure and the M2x is tempting as well, which I've been reading up on (long read). I'm new to solid state builds but one has to start somewhere. I'm very experienced in building with tubes. So I consider myself a not untypical forum member. I've never been critical of Nelson in any way, quite the reverse. I just asked a simple question about front ends. Simple because I come from tubes and it was an obvious question when exploring a new build.
If there is such a thing as "frequent visitors of this forum who think different", which I doubt because I see a variety of views here, then it must have existed before I asked the question, so it really isn't my affair and I have no wish to stir up arguments that I have no part in. This is the first time I've been told that "frequent visitors" to forums have some kind of different status, but in the bigger picture it's usually clear who the experts are and I prefer to see it that way. Experts are a goldmine of information. They don't always agree, though, nor is there any law saying they have to.
Thanks to everyone who has helped answer this question - I have some very useful information now that I didn't have before. And please go on posting. There may be other front ends and views on front ends still to come. It's a pretty fundamental part of any build.
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