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Old 24th August 2018, 07:57 PM   #11
Zen Mod is offline Zen Mod  Serbia
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few general remarks (more):

-every combination of THF51-S and P channel mosfet (say IRFP9240 or IRFP9140) , having difference of Ugs** to make at least 350mV window to squeeze opto bjt in , is proper candidate pair for usage in SissySIT .

** measured at 22-25Vdc rail and 1A8 to 2A Iq ; typically -3V5 for THF and 4V1 for IRFP9xxx, resulting in 600mV window

-without source resistors , paralleling of IRFP mosfets is harder task , so - use Keratherm for (that one) mosfet .

-power on thump is , even if there , practically benign ; power off thump even lesser

-as always with Papa-inspired amps, all settings finished in temp equilibrium ; be a Sissy , use multiturn trimpots ...... leave one turn trimpots to braver and more worthy ones

- for more comparison , of 42 and everything, download http://www.firstwatt.com/pdf/prod_sit3_man.pdf and readreadread , looklooklook , thinkthinkthink


that's it for now ..... must do some work on that schematic in first post, and include few missing (Z) diodes
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Last edited by Zen Mod; 24th August 2018 at 08:05 PM.
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Old 24th August 2018, 08:00 PM   #12
juanitox is offline juanitox  France
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Nice Monger sissie speaker��
The harmonic decay of the Sit3 is incredible .
Is it ok for 2sk82 too?
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Last edited by juanitox; 24th August 2018 at 08:11 PM.
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Old 24th August 2018, 09:39 PM   #13
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally Posted by juanitox View Post
......
Is it ok for 2sk82 too?
looking at I/U graphs with gate voltages , hardly to expect specimens having gate voltage lesser than -4V , to mate with P channel mosfet

rail up to 20, Iq up to 1A .....

so , pretty much - no
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Old 24th August 2018, 09:42 PM   #14
Michael Rothacher is offline Michael Rothacher  United States
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Schweeeet!
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Old 24th August 2018, 09:46 PM   #15
Zen Mod is offline Zen Mod  Serbia
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tnx Mr. MR
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Old 24th August 2018, 10:35 PM   #16
flocchini is offline flocchini  United States
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fantastic
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Old 24th August 2018, 11:17 PM   #17
Dennis Hui is offline Dennis Hui  Canada
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Great stuff, Mighty ZM.
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Old 25th August 2018, 12:11 AM   #18
plasnu is offline plasnu  United States
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Great!

How many THF51-S should I buy to make a matched stereo amp? Just 2 of them is OK?
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Old 25th August 2018, 12:33 AM   #19
Zen Mod is offline Zen Mod  Serbia
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with little luck,yes
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Old 25th August 2018, 12:37 AM   #20
Soundhappy is offline Soundhappy  France
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Mighty 400 watt´s SITokin are just sissy for Big Greedy Boyz
Interesting amplifier project thanks Zen Mod !
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