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Old 27th July 2012, 03:04 PM   #371
lhquam is offline lhquam  United States
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Quote:
Originally Posted by Zen Mod View Post
little patience can't harm

we'll be given with measured performance data , judging by previous experience



btw. Spice is here pretty much useless , just because Spice doesn't know drek about exact xformer

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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Old 27th July 2012, 03:09 PM   #372
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Quote:
Originally Posted by flocchini View Post
Choky
You weren't kidding about repeaters and gold - Jensens are a steal

2 X VINTAGE 1967 WESTERN ELECTRIC 111C REPEATING COIL / REP | eBay

I know I am quite happy about the Jensens in my F4 headphone setup
Best

Bob
Please guide me to find the schematic [bolded]. Thank you.
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Old 27th July 2012, 03:47 PM   #373
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Alo ... Just a quick drive by before a short trip away from the soldering iron.... Anyway at night I tried a number of biasing methods and also swapped out the gate stoppers to 1k (melonhead-thanks) ....

Varying degrees of failure generally so useful nothing to report , by far the best results were using the network per post 161 (results on post 185) ..... More mulling to do these few days ...
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Old 27th July 2012, 04:58 PM   #374
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Quote:
Originally Posted by lhquam View Post
at this point I cannot get decent distortion results (less than .01% at 1 watt) even with an "ideal" transformer.
Then you will be disappointed in the F6, as I am not even trying for lower than
0.1% at 1 watt.

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Old 27th July 2012, 05:11 PM   #375
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Quote:
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.

Crap, now i am interested again. Not a numbers guy.
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...Shape the sound , Man!
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Old 27th July 2012, 05:15 PM   #376
Zen Mod is offline Zen Mod  Serbia
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Quote:
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.

Pa

shoot them with THD spectra info



- "them" , because I'm ignorant and careless , regarding that



isn't it somewhere around 0,1@10W ?
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Last edited by Zen Mod; 27th July 2012 at 05:18 PM.
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Old 27th July 2012, 06:17 PM   #377
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Beware ZM is using subliminal

PS
probabily is not total recovery from papa jape
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Old 27th July 2012, 06:21 PM   #378
Zen Mod is offline Zen Mod  Serbia
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Laguna Seca !!

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Old 27th July 2012, 06:29 PM   #379
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Quote:
Originally Posted by Antoinel View Post
You fly the Serbian flag [from an earlier post]; but your mastery of the English language is downright excellent!

Please note than a DIYer of any discipline is inquisitive, craves experimentation and will seeks to implement own reproduction of any design. This DIYer will generally go where the weather suits its clothes. The bolded lyric was from the 60's or 70's by Nielsen. The complete lyric is "I am going where the sun keeps shining and the weather suits my clothes" Location and weather may have been CA.
If I remember correctly, it was Florida. It was the title song to the movie Midnight Cowboy.
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Old 27th July 2012, 06:30 PM   #380
lhquam is offline lhquam  United States
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Quote:
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... I just ran simulation with SemiSouth R100, without input buffer, (nearly) ideal transformer, 6x CLG, 1.5A bias, and get under .01% THD at 1kHz into 8 ohms. I haven't tried building the JFET follower input buffer yet. The R100 has 0R47 source degeneration. I haven't studied the R100 enough to understand its thermal characteristics and its need for source degeneration. I need to order parts to build a real one.
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