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2sk79 vfet pre
2sk79 vfet pre
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Old 6th November 2017, 11:41 PM   #1
vanofmonks is offline vanofmonks  United States
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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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File Type: png Pre7-2sk79-v1-brd-tp.png (36.9 KB, 497 views)
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Old 8th November 2017, 08:25 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, 05:34 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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Old 17th March 2018, 05:02 PM   #4
bvtrinh is offline bvtrinh  United States
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Hello, I was wondering if you ever finished this?
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Old 18th March 2018, 01:19 AM   #5
vanofmonks is offline vanofmonks  United States
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Quote:
Originally Posted by bvtrinh View Post
Hello, I was wondering if you ever finished this?
Funny you should ask, I am planning on starting tomorrow, so I'll update when I've made some progress. Here is a pic of the board.

Chris
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Old 18th March 2018, 06:25 AM   #6
bvtrinh is offline bvtrinh  United States
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Do you have any extra boards you would like to sell?
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