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2sk79 vfet pre
2sk79 vfet pre
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Old 7th November 2017, 12:41 AM   #1
vanofmonks is offline vanofmonks  United States
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Join Date: May 2006
Default 2sk79 vfet pre

So, here is my take on a 2sk79 vfet pre. It is based on my 12b4a pre I have been using for a couple of years. It incorporates a Swenson Regulator and Pimm Self Bias CCS. From the datasheet, the 2sk79 looks a lot like a 6dj8 to me, so that's how I treated it. It would need a volume control, PS, and be cap coupled on the output. I left the Cap off the pcb for cost reasons. I have some pcbs being made now to test. Any thoughts?
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Old 8th November 2017, 09:25 AM   #2
WalterW is offline WalterW  Netherlands
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2sk79 vfet pre
Nice, what's the +U PSU voltage?
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Old 8th November 2017, 06:34 PM   #3
vanofmonks is offline vanofmonks  United States
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I'll supply the board with 150v or so. Set the registration to 100-110v. The ccs will be 6-7ma so should bias at about 65v
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