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Old 1st November 2012, 01:13 PM   #1
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Default VFet F5

I may have missed this somewhere, I got lost in all the F5 posts, but has a Sony VFet F5 been tried or built? I'm referring to the 2SK82/2SJ28 set. I found several amps referred to on the web, but they all had capacitors in the output stage. I would like to avoid that if possible.
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Old 1st November 2012, 01:15 PM   #2
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search for meaning of depletion and enhanced mode biasing

those Vfets , being depletion mode , aren't so convenient to implement in F5 concept
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Old 1st November 2012, 02:19 PM   #3
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I guess I should have said a simplistic amp design using the Sony VFEts, without caps in the output stage. The amp I was referring to was designed by F. Corrado.
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Old 1st November 2012, 02:29 PM   #4
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link?
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Old 1st November 2012, 03:00 PM   #5
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http://www.amplimos.it/images/2SJ28%20SE%20AMP2.bmp

AMPLIMOS one stage amplifiers, amplificatori audio monostadio
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Old 1st November 2012, 03:26 PM   #6
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I was thinking of a simplified Sony TAN5550 or similar, since it did not have caps in the output. This is the amp I referred to.
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Old 1st November 2012, 03:31 PM   #7
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I know that one

nothing wrong with cap position - sort of part of Transnova circuit by Kirkland

whatever - even in common PSU arrangement , caps are in signal path ......
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Old 2nd November 2012, 09:16 PM   #8
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I have built an F5 type circuit with the Sony parts. It works fine, but the
heavy depletion bias voltage makes the circuit more complicated, so I'm
not rushing a DIY project out.

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Old 5th November 2012, 06:13 PM   #9
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I would be interested when you do, and interested in a few clues/guidelines. Still looking into reworking the Sony TAN5550 with these parts and simple circuit.
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