Yeah you are right about that. It s the connection point that played a trick to me 🙂
What about the rest ? Does it make any sense? 🙂
What about the rest ? Does it make any sense? 🙂
Oh and since the fets are depletion mode, the voltage sources do not have to be that big either?
not exactly
but - in situation in which we are , where Papa is still leaving us in the dark ( even if we are mostly responsible for dark itself) , it's counterproductive to continue guessing
major dilemma is - is it push pull or is it some sort of SE
in both ways we can guess and make decent amp .
question is now - which path is Papa's ?
I already drew some possible variations , and these are not even all .
each can be and must be tested and polished , but we are given with all needed details - source resistors for most linear behavior of SS Jfets , possible biasing techniques etc. .... but this thread is ( for now ) strictly about F6 , and just later we can play with (similar) iterations
more different ones deserve dedicated threads , mostly to not pollute this thread even more
and - yes - I didn't read that Papa sez that Jfets are depletion ?
I meant they're plain enhanced mode types ......
but - in situation in which we are , where Papa is still leaving us in the dark ( even if we are mostly responsible for dark itself) , it's counterproductive to continue guessing
major dilemma is - is it push pull or is it some sort of SE
in both ways we can guess and make decent amp .
question is now - which path is Papa's ?
I already drew some possible variations , and these are not even all .
each can be and must be tested and polished , but we are given with all needed details - source resistors for most linear behavior of SS Jfets , possible biasing techniques etc. .... but this thread is ( for now ) strictly about F6 , and just later we can play with (similar) iterations
more different ones deserve dedicated threads , mostly to not pollute this thread even more
and - yes - I didn't read that Papa sez that Jfets are depletion ?
I meant they're plain enhanced mode types ......
I thought the FETs are Semisouth R100 which are enhancement [channel is closed] ; meaning a positive Vgs is needed to turn them on like a bjt!
It looks SE to me, not push pull. The top FET is some sort of modulated CCS, call it a mu-follower, aleph CCS or whatever you want. Certainly is unique. Maybe Papa will coin new term for the layout.
Now that is an interesting [maybe genius] development. You suggest introducing a deliberate mismatch in the output JFETs; while the rest of the components and attendant signals supporting them are highly matched. Worth mulling the consequences over.
Then I should clarify. Is this amp expected to be the next evolutionary step toward audio nirvana...because I was going to order the boards for the F5
This amp will probably cost a bit more than the F5 with the transformers, outputs, different power supply.
you are waxing philosophical...but your point is well taken
Seriously thought...is this expected to be a project that is the "next step"? You know...worthy successor and all that?
I caught an interview with Nelson Pass. He is a very bright guy. I know of people selling their Macs so they can buy Pass amps...so he definitely has his stuff together.
I have often wondered how he balanced his support for DIY (which I appreciate) with his need to sell amps but I think he has discovered that you get as much as you give. A secret I wish everyone knew.
Seriously thought...is this expected to be a project that is the "next step"? You know...worthy successor and all that?
I caught an interview with Nelson Pass. He is a very bright guy. I know of people selling their Macs so they can buy Pass amps...so he definitely has his stuff together.
I have often wondered how he balanced his support for DIY (which I appreciate) with his need to sell amps but I think he has discovered that you get as much as you give. A secret I wish everyone knew.
It is genius. THe upper JFET is an Enhancement device and the lower JFET is a Depletion device. Thus, my simplistic mental picture in an earlier thread works. For a positive drive, the channel of the upper JFET is open and that of the bottom one is choked. Current flows from the enhancement JFET to the load to ground. For a negative drive, the depletion device turns on and the enhancement JFET simultaneously turn off. Current flows from ground through the load and though the lower depletion JFET.
........
exactly what I'm trying to learn all my years - how to not grow up and have all the fun
exactly what I'm trying to learn all my years - how to not grow up and have all the fun