mrdarrett@gmail.com wrote:> Fascinating reading: > http://www.irf.com/technical-info/appnotes/an-948.pdfIt's relatively primitive rubbish. OK as an AN but no more.> (found from here: http://sound.westhost.com/articles/hexfet.htm) > > I've heard that the 2SK1058 is superior for audio, and is the only > MOSFET spec'ed in Slone's book, but that this MOSFET is currently now > unobtanium.Lateral Mosfet instead of vertical. NOT a drop-in replacement. Lateral Mosfets are indeed considered better for audio but I only know of 2 sources now (Hitachi having introduced them originally but now withdrawn them). They are Exicon and Semelab. Farnell have some of them IIRC. Pricey too but very durable. Graham
Application Note 948 - Linear Power Amplifier Using Complementary HEXFETs
Started by ●July 9, 2008
Reply by ●July 10, 20082008-07-10
Reply by ●July 10, 20082008-07-10
On Jul 10, 6:46 am, Eeyore <rabbitsfriendsandrelati...@hotmail.com> wrote:> mrdarr...@gmail.com wrote: > > Fascinating reading: > >http://www.irf.com/technical-info/appnotes/an-948.pdf > > It's relatively primitive rubbish. OK as an AN but no more. > > > (found from here: http://sound.westhost.com/articles/hexfet.htm) > > > I've heard that the 2SK1058 is superior for audio, and is the only > > MOSFET spec'ed in Slone's book, but that this MOSFET is currently now > > unobtanium. > > Lateral Mosfet instead of vertical. NOT a drop-in replacement. > > Lateral Mosfets are indeed considered better for audio but I only know of > 2 sources now (Hitachi having introduced them originally but now withdrawn > them). They are Exicon and Semelab. > > Farnell have some of them IIRC. Pricey too but very durable. > > GrahamThanks. Why did Hitachi withdraw them? Michael
Reply by ●July 10, 20082008-07-10
On Jul 10, 9:00 am, mrdarr...@gmail.com wrote:> On Jul 10, 6:46 am, Eeyore <rabbitsfriendsandrelati...@hotmail.com> > wrote: > > > > > mrdarr...@gmail.com wrote: > > > Fascinating reading: > > >http://www.irf.com/technical-info/appnotes/an-948.pdf > > > It's relatively primitive rubbish. OK as an AN but no more. > > > > (found from here: http://sound.westhost.com/articles/hexfet.htm) > > > > I've heard that the 2SK1058 is superior for audio, and is the only > > > MOSFET spec'ed in Slone's book, but that this MOSFET is currently now > > > unobtanium. > > > Lateral Mosfet instead of vertical. NOT a drop-in replacement. > > > Lateral Mosfets are indeed considered better for audio but I only know of > > 2 sources now (Hitachi having introduced them originally but now withdrawn > > them). They are Exicon and Semelab. > > > Farnell have some of them IIRC. Pricey too but very durable. > > > Graham > > Thanks. > > Why did Hitachi withdraw them? > > MichaelAh... looks like Renesas bought the line from Hitachi http://documentation.renesas.com/eng/products/transistor/rej03g0906_2sk1056ds.pdf Michael
Reply by ●July 10, 20082008-07-10
mrdarrett@gmail.com wrote:> On Jul 10, 9:00 am, mrdarr...@gmail.com wrote: > > > > Why did Hitachi withdraw them? > > Ah... looks like Renesas bought the line from Hitachi > > http://documentation.renesas.com/eng/products/transistor/rej03g0906_2sk1056ds.pdfNot a big enough quantity seller probably. The TO-3 package versions disappeared first, sigh. TO-3 provides such a superb thermal interface. They make SUPERB amplifiers when designed in right but people just want cheap these days. Graham
Reply by ●July 10, 20082008-07-10
On Thu, 10 Jul 2008 09:37:17 -0700 (PDT), mrdarrett@gmail.com wrote:>On Jul 10, 9:00 am, mrdarr...@gmail.com wrote: >> On Jul 10, 6:46 am, Eeyore <rabbitsfriendsandrelati...@hotmail.com> >> wrote: >> >> >> >> > mrdarr...@gmail.com wrote: >> > > Fascinating reading: >> > >http://www.irf.com/technical-info/appnotes/an-948.pdf >> >> > It's relatively primitive rubbish. OK as an AN but no more. >> >> > > (found from here: http://sound.westhost.com/articles/hexfet.htm) >> >> > > I've heard that the 2SK1058 is superior for audio, and is the only >> > > MOSFET spec'ed in Slone's book, but that this MOSFET is currently now >> > > unobtanium. >> >> > Lateral Mosfet instead of vertical. NOT a drop-in replacement. >> >> > Lateral Mosfets are indeed considered better for audio but I only know of >> > 2 sources now (Hitachi having introduced them originally but now withdrawn >> > them). They are Exicon and Semelab. >> >> > Farnell have some of them IIRC. Pricey too but very durable. >> >> > Graham >> >> Thanks. >> >> Why did Hitachi withdraw them? >> >> Michael > > >Ah... looks like Renesas bought the line from Hitachi > >http://documentation.renesas.com/eng/products/transistor/rej03g0906_2sk1056ds.pdf >Renesas is Hitachi Semi Division. Not a technology split between discrete and integrated, either, though they ARE retiring discrete part numbers like mad. RL
Reply by ●July 13, 20082008-07-13
On Thu, 10 Jul 2008 09:37:17 -0700 (PDT), mrdarrett@gmail.com wrote:>On Jul 10, 9:00 am, mrdarr...@gmail.com wrote: >> On Jul 10, 6:46 am, Eeyore <rabbitsfriendsandrelati...@hotmail.com> >> wrote: >> >> >> >> > mrdarr...@gmail.com wrote: >> > > Fascinating reading: >> > >http://www.irf.com/technical-info/appnotes/an-948.pdf >> >> > It's relatively primitive rubbish. OK as an AN but no more. >> >> > > (found from here: http://sound.westhost.com/articles/hexfet.htm) >> >> > > I've heard that the 2SK1058 is superior for audio, and is the only >> > > MOSFET spec'ed in Slone's book, but that this MOSFET is currently now >> > > unobtanium. >> >> > Lateral Mosfet instead of vertical. NOT a drop-in replacement. >> >> > Lateral Mosfets are indeed considered better for audio but I only know of >> > 2 sources now (Hitachi having introduced them originally but now withdrawn >> > them). They are Exicon and Semelab. >>(going through some old notes) The Semelab equivalent of 2sk108 is(was) BUZ900P, or USP16N10, depending upon which side of the Atlantic it is marketed by Magnatec. http://www.magnatec-uk.co.uk/ RL
