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Old 29th September 2012, 04:56 PM   #2091
lhquam is offline lhquam  United States
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What is your guess about Pa's secret? Is it discovering "sweet spot" (aka load line), or additional circuitry?

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difference is ,while I'm not, Pa is exactly knowing why he's laughing ......
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Old 29th September 2012, 05:05 PM   #2092
Zen Mod is offline Zen Mod  Serbia
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sweet spot , most certainly

even if , without doubt , he knows how to make that with additional circuitry
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Old 29th September 2012, 06:56 PM   #2093
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What is your guess about Pa's secret? Is it discovering "sweet spot" (aka load line), or additional circuitry?
Gm of output power devices matched to <1% or even lesser, and similar tight tolerances for the passives.
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Old 29th September 2012, 06:57 PM   #2094
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Gm of output power devices matched to <1% or even lesser, and similar tight tolerances for the passives.
You assume the sweet spot is equivalent with lowest distortion.
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Old 29th September 2012, 07:32 PM   #2095
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Announcement of Papa's article release, that will be the sweet post.

Last edited by bobodioulasso; 29th September 2012 at 07:42 PM.
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Old 29th September 2012, 07:47 PM   #2096
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On his site he says beginning of the year. Perhaps it will get pushed up. He doesnt seem like the type to rush.
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Old 29th September 2012, 08:10 PM   #2097
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You assume the sweet spot is equivalent with lowest distortion.
Not lowest distortion; but device matching; compare SuSy which must have highly matched devices to attain high symmetry. Loop feedback in Mr. Pass's F6 is to lower output Z primarily and secondarily % THD. His F6 is almost perfect before he applies loop feedback. One of his early posts [#14] said:

The transformer secondaries are set up to drive the Fets in a matched fashion, if that is what you're asking.

I understood the wording matched in his statement above to mean got to go the distance and match everything else; otherwise settle for a mishmash of mismatches; and this is not his practice? Besides, the writeup of the old classic in post #38 stressed using matched bjt output devices.

Last edited by Antoinel; 29th September 2012 at 08:26 PM.
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Old 29th September 2012, 09:43 PM   #2098
Zen Mod is offline Zen Mod  Serbia
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(almost ) all tricks are shown

everybody can make his own F6 wannabee easily

Pa's ears are his own , not yours
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Old 29th September 2012, 10:03 PM   #2099
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Just for making a word play spot/post.
If i got R100s i would rather try a J2.
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Old 29th September 2012, 10:33 PM   #2100
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I agree with ZM. Make your own. Also, dont assume anything about how amp sounds compared to J2. Probably very similar signature
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