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Old 27th July 2012, 06:38 PM   #381
Rush is offline Rush  United States
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Could the F6 be built with these devises: 2SK82 and 2SJ28 ?
I bought a pair of each a while back and need a project for them.

Rush
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Old 27th July 2012, 06:43 PM   #382
Zen Mod is offline Zen Mod  Serbia
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probably too much complicated , at least comparing to intended SS ones

difference is that your's are depletion mode devices , needing negative voltage on gate (ref. source) for proper biasing , while SS SJEP are enhanced mode devices , needing positive voltage on gates (ref. source) for proper biasing

meaning - for SS , all you need is few resitors , pots and caps

for your's - you need at least one additional PSU rail , more negative than main -PSU
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Old 27th July 2012, 06:47 PM   #383
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Old 27th July 2012, 06:48 PM   #384
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Could the F6 be built with these devises: 2SK82 and 2SJ28 ?
I bought a pair of each a while back and need a project for them.

Rush
Ill get to it eventually with R085. As ZM has suggested, we dont know whats going on with bias and any tricks Nelson might be pulling. All smoke and mirrors for now.
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Old 27th July 2012, 07:03 PM   #385
Zen Mod is offline Zen Mod  Serbia
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if you mean on depletion R085 - it's not worth complication , if you ask me

sometime is needed to draw a line in overcomplication

(sez a guy who is Babelfishing Papa's simple amps in something much less simple )
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Old 27th July 2012, 07:08 PM   #386
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If I remember correctly, it was Florida. It was the title song to the movie Midnight Cowboy.
Right on!.
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Old 27th July 2012, 08:33 PM   #387
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Originally Posted by lhquam View Post
I have taken up the challenge to try fill in parts of the F6 design before Nelson releases his complete design and specs.
I agree that SPICE doesn't know much about transformers, but at this point I cannot get decent distortion results (less than .01% at 1 watt) even with an "ideal" transformer.
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Originally Posted by Nelson Pass View Post
Then you will be disappointed in the F6, as I am not even trying for lower than
0.1% at 1 watt.
For me not the measured results is the benchmark (particularly regarded the value of low order THD), but the perception sonic results by listening tests at various loads (i. e. various loudspeakers).

More Ideas:
The first both topologies about
http://www.ant-audio.co.uk/Theory/N-...0linearity.pdf
shows a NMOS Power gain output PP stage (common source) and Current gain output PP stage (source follower).
Is this also possible with a passive solution (i. e. by use of a driver transformer, as intended here) ??

Last edited by tiefbassuebertr; 27th July 2012 at 08:36 PM.
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Old 27th July 2012, 09:02 PM   #388
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Originally Posted by tiefbassuebertr View Post
For me not the measured results is the benchmark (particularly regarded the value of low order THD), but the perception sonic results by listening tests at various loads (i. e. various loudspeakers).

More Ideas:
The first both topologies about
http://www.ant-audio.co.uk/Theory/N-...0linearity.pdf
shows a NMOS Power gain output PP stage (common source) and Current gain output PP stage (source follower).
Is this also possible with a passive solution (i. e. by use of a driver transformer, as intended here) ??
The first two schematics are interesting. The second one describes a linear transconductance amp; noting the general interest in this type of amp.
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Old 27th July 2012, 11:29 PM   #389
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Originally Posted by Antoinel View Post
Please guide me to find the schematic [bolded]. Thank you.
F4 power amplifier

F4 power amplifier

and following

the links above are to different pages in the F4 thread
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Old 28th July 2012, 02:16 AM   #390
lhquam is offline lhquam  United States
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Originally Posted by Nelson Pass View Post
Then you will be disappointed in the F6, as I am not even trying for lower than
0.1% at 1 watt.

Hmmm. Another misdirection? I think it can do a lot better, depending on the xformer.
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