And misunderstanding goes on and on. This forum section is not a Cult where you are not allowed to criticize the “Authority above”. Fact is, it’s hard to find any reasons to complain about Nelson’s generous contribution and designs shared. I find your question as perfectly fine. Not that it matters what I think as you pointed out with fine words whose opinion matters. And you are right there. 🙂
I’m not fine with assigning to me something I didn't say. I never said that ‘frequent forum section visitors’ have some kid of different status.
"This forum section is not a Cult where you are not allowed to criticize the “Authority above”...."
I'd just like to add something on creativity. As a psychologist, creativity and creative people were one of my main research subjects for a good 30 years. Nelson Pass himself is clearly a high creative - it shows in all his work, his attitudes and his interviews. Now, one of the fundamental things about high creatives is that they don't follow rules, they break rules. They question everything.... constantly. They don't follow styles, they make styles. So in music, for instance, we hear a lot about "The Beethoven Style" or "The Bach Style" or whatever - musicologist love that kind of thing. But if you want to be true to Beethoven or Bach or anyone else, you would think like they would think - question everything, break all the rules, do something different and see how it works. If Beethoven or Bach were alive today they might have been punk rockers.
It's a neat little puzzle. You follow where the geniuses of this world lead. But that's the last thing they would have done themselves.
I'd just like to add something on creativity. As a psychologist, creativity and creative people were one of my main research subjects for a good 30 years. Nelson Pass himself is clearly a high creative - it shows in all his work, his attitudes and his interviews. Now, one of the fundamental things about high creatives is that they don't follow rules, they break rules. They question everything.... constantly. They don't follow styles, they make styles. So in music, for instance, we hear a lot about "The Beethoven Style" or "The Bach Style" or whatever - musicologist love that kind of thing. But if you want to be true to Beethoven or Bach or anyone else, you would think like they would think - question everything, break all the rules, do something different and see how it works. If Beethoven or Bach were alive today they might have been punk rockers.
It's a neat little puzzle. You follow where the geniuses of this world lead. But that's the last thing they would have done themselves.
now, (creativity and sharing) that's fine subject to follow, besides main one (posted in thread opening post)
everything else was a distraction
now, what I posted in #27 was just a list taken from Articles page on FW site, by criteria you asked about
of course there are several Papa's constructions more (by criteria you asked about) but as I'm notoriously lost both in time and space, I can try later to think and post but only random results can be expected .....
for instance, original Alephs are all having mosfet input LTP; all parts directly obtainable from nearest Grocery Store
everything else was a distraction
now, what I posted in #27 was just a list taken from Articles page on FW site, by criteria you asked about
of course there are several Papa's constructions more (by criteria you asked about) but as I'm notoriously lost both in time and space, I can try later to think and post but only random results can be expected .....
for instance, original Alephs are all having mosfet input LTP; all parts directly obtainable from nearest Grocery Store
Now we’re talking, Andy! Nelson has several front ends that fit your criteria, including the latest. There are also designs by others in this forum that use new devices. Just look through the threads.
I for one, stashed enough to propel me through the rest of my days. While they are available, I would suggest folks stash away anything your future will need. Even if they are available now in store, they won't always be. If you know there are 2 or 3 First Watt clones you wish to build, buy them now! Don't worry, if you decide to build a different one, they will be used eventually, or let another member use them.
Russellc
I've been doing this myself. So I've now got a lifetime supply of Sanyo 2SA1407 / 2SC3601 devices, which are pretty much ideal for 2nd stage "VAS" duty. And a lifetime supply of Toshiba 2SA1930 / 2SC5171 drivers. And a lifetime supply of Fairchild KSA1220A / KSC2690A high voltage, high beta, high fT devices for line level applications. And a lifetime supply of MPS6571's (plus their even-more-rare complements, the MPS6523) for those occasions when I feel like cloning 1970's era Threshold equipment. And on and on. Buy now, while you can, then enjoy later.
The 5566 was popular, I think, used also by Spectral and PS Audio, like in the PS 4.6 I still have.
Sorry I don’t have the exact link but someone in one of the F6 threads replaced the 170/74 buffer stage with cheap current alternatives and the Jensen step up transformer with a cheap Triad model, and found that it came rather close in terms of sound quality to the official circuit.
I haven't seen that but I have a circuit using J113 and those Triads, meaning to do
A PC board for it.
A PC board for it.
I'm surprised it didn't go further. Not as snazzy as the Toshiba/Jensen/SemiSouth but very practical.
That's the the transformer I used in the Glow-FET. I think they're pretty swell. 🙂
I just read FW about F6. A case where MOSFETs sounds better than SITs........
The amp has data a bit like the M2. M2 has not feedback F6 a little......then it handles 4 ohm a bit better.....with more power.
The amp has data a bit like the M2. M2 has not feedback F6 a little......then it handles 4 ohm a bit better.....with more power.
The F6 is a good amp to experiment with alternate input stages. The F6 PCBs have the simple JFet input. With a little ingenuity one can install one of the many M2x unity gain stages that use other types of transistors or even opamps. My F6 is running with a tweaked version of the Austin input stage. Sounds great that way.
Ok, so the version we will get here in DIY could be a F6x?
Interesting it uses the same devices for the PP configuration and the use of a transformer as phase splitter.
It will probably make good sense to spend some time to match the two output devices. Now that they are identical the matching can be almost perfect.
A quad would be the best for stereo or an octet if amp uses parallel output devices for more power.
Interesting it uses the same devices for the PP configuration and the use of a transformer as phase splitter.
It will probably make good sense to spend some time to match the two output devices. Now that they are identical the matching can be almost perfect.
A quad would be the best for stereo or an octet if amp uses parallel output devices for more power.
It only takes a couple of weeks to teach yourself PCB layout. Then you can crank out F6 variants at will, as many as you please.
It could be fun to learn.
I don't know if NP's comments indicated that a F6 or F6x DIY project was during development.
I read it that way but maybe it was a bit too optimistic...... 🙂
I don't know if NP's comments indicated that a F6 or F6x DIY project was during development.
I read it that way but maybe it was a bit too optimistic...... 🙂
I have been having great luck with EasyEDA. I have Eagle and Kicad on my computer and have had no real reason to learn to use it. If someone has a schematic they would like me to draw for a variant of the F6, I have fun doing it. You would have to be the guinnae pig though.
A while back drew up a drill/hole template for the UMS hole pattern which I should be able to confirm against a DIYstore chassis within the next couple of weeks.
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