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27th August 2009, 07:49 PM
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#1 |
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The one and only
Join Date: Mar 2001
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Beast with a Thousand JFETs
Jam called me up and asked if I have ever paralleled up a
bunch of 2SK170's and 2SJ74's to make a power output stage. I guess it's time to unveil the Beast with a Thousand JFETs. Here's the first teaser, a circuit panel to hold 588 JFETs and associated resistors. |
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27th August 2009, 08:01 PM
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#2 |
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diyAudio Member
Join Date: Mar 2007
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How do the capacitances compare with an equivalent group of power fets? I'm curious to see what you can do with this
 Will you need to do any matching? (or just wing it) Pardon my ignorance, I'm not a huge ss designer.
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27th August 2009, 08:04 PM
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#3 | |
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diyAudio Chief Moderator
Join Date: Oct 2002
Location: Athens-Greece
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27th August 2009, 08:50 PM
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#5 | |
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The one and only
Join Date: Mar 2001
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Quote:
What cooling? currently ripping: Outernational Sound, Thievery Corporation |
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27th August 2009, 08:59 PM
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#7 |
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diyAudio Member
Join Date: Dec 2003
Location: Sierra Foothills - California
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Nelson,
As I recall you did something similar once before many years ago - paralleling lots of JFET's. If this beast has a thousand JFET's then there must be two of these panels required? And with 2SJ74's the voltage rails will probably have to be in the Firstwatt power amp range? By golly the thing is starting to look like a simplified version (did I actually say that out loud?) of the F4. Graeme |
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27th August 2009, 09:10 PM
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#8 | |
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diyAudio Member
Join Date: Oct 2004
Location: At the sea front, Rotterdam or Curaçao
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27th August 2009, 09:13 PM
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#9 | |
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diyAudio Member
Join Date: Jan 2008
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27th August 2009, 09:32 PM
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#10 |
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diyAudio Member
Join Date: Oct 2003
Location: osorno , Chile
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Since J74 is not that easy to source, I will go single ended.
 In fact, as a premonition, I started to source the 170 months ago... Heat? I heard someone immersed some amp on oil...maybe vaseline, with its many uses , could also work.Regards, M
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