SissySIT

OK~! just learned one thing.. :)
The more I look into your circuit it is educational and interesting.

Could you also comment on the red circled one? :D
Why these are not there in the SissySIT?
 

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Official Court Jester
Joined 2003
Paid Member
they are here ...... D3 being in same place , still , working same duty in both Babelfish M25 and SissySIT - preventing lower gate to wrap around output node in positive clipping for more than one diode drop voltage

in case of Babelfish M25 and M2 , D1 and D2 are doing same thing , for negative clipping - preventing upper gate to wrap around output node for more than 2 diode drop voltages

however , in SissySIT , upper gate is already bellow output node , so leaving D1 and D2 here is Big NoNo , they will conduct pronto , so bye with any function of ....anything :rofl:

so ,fro SissySIT, toss out D1 and D2 , introduce D4 and D5 , and they'll prevent upper gate to wrap around neg rail for more than 2 diode drop voltages

simple , isn't it ?

:)

also observe difference in orientation of ZD1, SissySIT vs. Babelfish M25
 
Official Court Jester
Joined 2003
Paid Member
it's simple ....... just imagine what's happening when dumb or drunk operator turns preamp volume control few full circles , then some

input buffer goes Berserk , autoformer is even multiplying that berserk , while gates of output devices are trying to reach both roof and cellar ..........

in same time , PSU rails are much lower than roof and much higher than cellar , and sources are simply unable to leave window between two rails

so , something must be there to prevent gates to go out of building

:)
 
Member
Joined 2007
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ZM, how low could one let go Iq, lets say not having Berserker but more a Sissy SissySIT? Have very sensitive speakers (100db) and can't radiate 170 Watt in my living room environment BUT I am highly interested in the SIT sound. Any chance for that or is ist the wrong amp to do such a thing?

Cheers

Ernst
 
Official Court Jester
Joined 2003
Paid Member
according to your table , no go ..... no certain voltage window to squeeze opto bjt in

gate to gate is different , so other solutions already shown in Most Greedy Boy, of them all... or (there is no) DEFiSIT of Papa's Koans are viable

of course , one can be sure only after testing exact 2SK182 specimens under prescribed conditions - rails 22 to 25V and Iq 1A8 to 2A
 
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