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Old 29th July 2013, 08:28 PM   #3651
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Quote:
Originally Posted by valvesound View Post
So does this mean that there is no effect of the electrolytics on the sound?
Which ones ? The f4 is a current buffer so the cap should have less effect because of no voltage gain . That is at least my take on it .
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Old 29th July 2013, 08:34 PM   #3652
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I would listen first. If you like it, then you have the possibility of tweaking the sound with cap choice. If you don't like it, you saved that little bit'o money for the next build.
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Old 30th July 2013, 07:42 AM   #3653
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For C1 and C2.....I'll try it first with the standard 220u Elna silmic's and then maybe try 22u polyprops as they do show on sim to be sufficient. Maybe someone has tried that and can comment on it.
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Old 30th July 2013, 09:02 PM   #3654
generg is offline generg  Germany
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The values of the caps are so high to minimize the turn on plopp.....of course 22uF are enough for audio purposes but I suppose not to avoid the plopp.....

The simulation can't hear the Plopp!
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Last edited by generg; 30th July 2013 at 09:08 PM.
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Old 30th July 2013, 09:07 PM   #3655
generg is offline generg  Germany
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You can try the solution Nelson used in BA-2


10uF of a good film cap or Elna 10uF/16V from the inputstage and 1000uF in the upper branch to avoid the Plopp!
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Old 31st July 2013, 06:21 AM   #3656
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thanks for the good explanation and suggestion generg
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Old 2nd August 2013, 06:33 AM   #3657
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hi all
can sony 2sk82/2sj28 or semisouth r100 be adapted to work in this design
I,m looking for something they will drop into with minimal fuss and make 25 to 50w

Sheafer

Last edited by slr 5000; 2nd August 2013 at 06:42 AM.
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Old 2nd August 2013, 07:52 AM   #3658
Zen Mod is offline Zen Mod  Serbia
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2sk82/2sj28 - yes ( more than few amps are floating around , made with them as follower stage)

SSR100 - you need counterpart for it ...... and there is none
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Old 2nd August 2013, 07:56 AM   #3659
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hi Zen
that is what I was hoping to hear

any chance of one of your famous sketches ? I am thinking about one pair per channel

rgds Sheafer
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Old 2nd August 2013, 08:19 AM   #3660
Zen Mod is offline Zen Mod  Serbia
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frankly - in source follower iteration , I can't see any value of using old , made of preputium , parts ;
make F4 lookalike and save Sony parts for something where you can more exploit their rare transfer characteristic

say something as F6 complementary ....... there you can find one sketch of Mighty ZM, still untested
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