I love the sound of a good amp using one 2sa1943 and 2sc5200 pair per channel for the output stage.
I want to build an amp with the best transistors available for use as a single pair per channel and running at no more than 100W
Does the frequency of a MOSFET (~30mhz to the best of my recollection for the 2sa 2sc pairs) determine the maximum sample rate the amp can reproduce?
I think I like Toshiba brand transistors best for the output stage. I have A1940s and A1265s in my scrap pile. Each with their opposite tranny. How many smaller transistors should I use for the driver stage. Should I add an AC cap and an inductor to the driver circuits?
of course I mean the driver stage that comes between the rectifier/filter and the output transistor stage
Out of all similar size trannies out there, which one is best for hifi? Is there anything by Toshiba that's like the 2sa 2sc pair I mentioned but made more specifically for top end amp design or higher quality than the 2sc and 2sas
Which tranny combo sounds best as a single pair for the output stage?
For average 40W per channel.?
Is there a pass labs amp design out there that meets my needs?
Thanks a.lot!!!!!!!
I want to build an amp with the best transistors available for use as a single pair per channel and running at no more than 100W
Does the frequency of a MOSFET (~30mhz to the best of my recollection for the 2sa 2sc pairs) determine the maximum sample rate the amp can reproduce?
I think I like Toshiba brand transistors best for the output stage. I have A1940s and A1265s in my scrap pile. Each with their opposite tranny. How many smaller transistors should I use for the driver stage. Should I add an AC cap and an inductor to the driver circuits?
of course I mean the driver stage that comes between the rectifier/filter and the output transistor stage
Out of all similar size trannies out there, which one is best for hifi? Is there anything by Toshiba that's like the 2sa 2sc pair I mentioned but made more specifically for top end amp design or higher quality than the 2sc and 2sas
Which tranny combo sounds best as a single pair for the output stage?
For average 40W per channel.?
Is there a pass labs amp design out there that meets my needs?
Thanks a.lot!!!!!!!
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TTA1943 and TTC5200 are available.
These new versions have slightly better specs (higher min. DC gain and lower Cob) than 2SA1943 and 2SC5200, but not sure if any audible difference.
These new versions have slightly better specs (higher min. DC gain and lower Cob) than 2SA1943 and 2SC5200, but not sure if any audible difference.
The TT versions have been around for more than 10 years and were produced in China as the only remaining TO264 package versions after Toshiba Japan cut production to only TO3P types, identified as 2SC5200N, 2SA1943N. Apparently, the TT versions also have a somewhat smaller die than the original products.
I can't say what the present manufacturing situation is but you may buy them in either package, marked JAPAN or CHINA and there are plenty of fakes too, though whether the marking of genuine product is really valid as the source ID, is also doubtful since the alleged Chinese product has also been marked JAPAN for many years.
I can't say what the present manufacturing situation is but you may buy them in either package, marked JAPAN or CHINA and there are plenty of fakes too, though whether the marking of genuine product is really valid as the source ID, is also doubtful since the alleged Chinese product has also been marked JAPAN for many years.
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On Semi continue the production of 2SA1943 and 2SC5200, you can buy it on mouser, no reason for replacement.
Mouser's Onsemi versions are actually Fairchild's old FJL4215/4315. These can perform well too, as long as they are in the appropriate Hfe range. Problem is, the prices aren't competitive with Toshiba product.
@Ian Finch In the past KSA1943 and KSC5200 were present from fairchild as well. Seems like the fairchild bought toshiba production line and then onsemi bought fairchild, so technically it is the same 🤔
I wouldn't get too specific about components before researching what is really going to be sufficient for your needs. We can spend crazy amounts of money on alleged superior quality, massively oversized lumps of metal boxes and controls, fasteners, connectors, electronic components and exotic cables etc. but still wind up with mediocre sound. Then there are lots of different technical paths to great sound that somehow seem to work just as well or at least sound great even though they're technically bad. Great sound quality is not the same as technical excellence and many of us are here to say so.
As Nelson Pass shows, he works almost exclusively with class A amps - the big, hot and fuel-inefficient type that can deliver very clean sound but at the cost of significant power waste, unless you don't really need much power anyway. 100W may look insignificant on paper until you hear it and feel your ears bleeding as it roars at you from efficient loudspeakers. However, only 10W can blow you away with the right speakers. It's all I actually need and then some, unless I'm testing something that requires high power levels for some reason.
Not quite. Fairchild simply copied Toshiba products as best they could at competitive prices. Of course, Onsemi now controls Fairchild's production and marketing but it doesn't make theirs more like Toshiba's product. As the JIS part number allocation was exclusive to the original manufacturer, others could not freely use it for the ID of their equivalents in any case.