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Old 23rd November 2021, 11:25 PM   #1041
Soundhappy is offline Soundhappy  France
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@ Diyers

Ok at 1 Watt get nice distortion 2 harmonic profile many amp's can show similar figures
but at 20 or 50 Watts distortion rise super fast and % is much higher with Tokin's.
Again maybe from J Broskie article or from MEPER post # While they last...
Sakuma style solution..or new Mr. Pass ?
Can be interesting to learn and experiment.
Use LTSpice first so no danger of smell the smoke
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Old 23rd November 2021, 11:33 PM   #1042
Ben Mah is offline Ben Mah  Canada
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Mu follower common drain THF-51S at onset of clipping (50W into 8 Ohm), left and right channels. Two percent THD is quite good and probably no worse than VFETs, except VFET can't output 50W.

20W added.

Last edited by Ben Mah; 23rd November 2021 at 11:39 PM.
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Old 24th November 2021, 05:21 AM   #1043
Adams_Leo is offline Adams_Leo  China
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WOW,fantastic.
My plan DN2540 buffer and then KP926 driver 2SK182/THF-51S follower with chock load.I am waiting for the chassis.
Also I am consider ZM's buffer.
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Old 24th November 2021, 11:01 AM   #1044
triode_al is offline triode_al  Netherlands
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Quote:
Originally Posted by Soundhappy View Post
@ Diyers

Ok at 1 Watt get nice distortion 2 harmonic profile many amp's can show similar figures. . .

Use LTSpice first so no danger of smell the smoke
here my experimental set for the source followers
Various feedback, also the famous F6-style feedback.
The transformer is modelled so-so, could be improved
Attached Files
File Type: asc 2SK182_ exp SIT source follower.asc (28.3 KB, 17 views)
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Old 24th November 2021, 11:26 AM   #1045
stonegreen is offline stonegreen  Germany
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Default missing symbol 'xnjf'

Thanks for the experimental set, but there is a problem with loading.
Attached Images
File Type: jpg SIT_source.jpg (4.7 KB, 231 views)
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Old 24th November 2021, 02:52 PM   #1046
Botte is offline Botte  United States
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Hi Ben,

I have similar results. I did increase the bias to 2.6 amps and it increased the 4 ohm power but it didnt sound better. It also increased the heat dissipation so, I cut it back to 2.2 amps.
Attached Images
File Type: jpeg FF0D7611-FDD4-4B87-BC60-6450F035FA93.jpeg (579.5 KB, 214 views)
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Old 24th November 2021, 05:17 PM   #1047
stonegreen is offline stonegreen  Germany
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Quote:
Originally Posted by stonegreen View Post
Thanks for the experimental set, but there is a problem with loading.
I replaced the missing symbol with an 'njf' and set the prefix to 'X'. Now everything is OK.
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Old 25th November 2021, 11:18 AM   #1048
triode_al is offline triode_al  Netherlands
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here they are
XNJF.asy looks as follows (cant upload the symbol)
Quote:
Version 4
SymbolType CELL
LINE Normal 16 16 16 80
LINE Normal 48 72 48 96
LINE Normal 16 72 48 72
LINE Normal 48 24 48 0
LINE Normal 16 24 48 24
LINE Normal 0 64 4 64
LINE Normal 4 68 16 64
LINE Normal 4 60 16 64
LINE Normal 4 60 4 68
WINDOW 0 56 32 Left 2
WINDOW 3 56 72 Left 2
SYMATTR Value NJF
SYMATTR Prefix X
SYMATTR Description N-Channel JFET
PIN 48 0 LEFT 5
PINATTR PinName D
PINATTR SpiceOrder 1
PIN 0 64 TOP 5
PINATTR PinName G
PINATTR SpiceOrder 2
PIN 48 96 LEFT 5
PINATTR PinName S
PINATTR SpiceOrder 3
Place it with a text editor where the LTSpice can find it. I have it high on the file structure, but it really should be where other ASY's are.
Attached Files
File Type: txt xnjf.asy.txt (539 Bytes, 3 views)
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Old 25th November 2021, 12:01 PM   #1049
triode_al is offline triode_al  Netherlands
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For some more fun (but this thread is not for that ; sorry S.)

drain loaded

Schermafbeelding 2021-11-25 om 12.58.29.png
Attached Files
File Type: asc SIT 2sk180 @50.asc (9.0 KB, 4 views)
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