The tube stage has zero gain (x1), as it's a pushpull cathode follower sitting on a current source.
The MOSFET stage I can't make any sense out of - where's the load in that weird drawn schematic? Are the loads meant to be the two boxes marked "0.5"??
Simulation schematics don't mean much to real engineers...
Regards, Allen
The MOSFET stage I can't make any sense out of - where's the load in that weird drawn schematic? Are the loads meant to be the two boxes marked "0.5"??
Simulation schematics don't mean much to real engineers...
Regards, Allen
He almost never answers questions by email.
Can't help you with a simulation circuit. His real circuit makes a little more sense - but I believe he almost never builds any of these circuits he publishes, so why chase fairies?
There are hundreds of great proven circuits out there.
Regards, Allen
Can't help you with a simulation circuit. His real circuit makes a little more sense - but I believe he almost never builds any of these circuits he publishes, so why chase fairies?
There are hundreds of great proven circuits out there.
Regards, Allen
There are several SS amps that use this output stage I have seen posted around here from time to time. Successful commercial amps at that. Sorry I cant recall the names of them at the moment.
By "real engineers" I suppose you mean those old goofs with white coats and a slide ruler sticking out of their breastpockets😉.
The schematic(with or without simulation) doesn´t make sense anyway......
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I believe that circuite has 6db gain. If you look at broskie's article on power boosters
he describes a push pull power follower circuite where the output is grounded and
the output is taken from the junction of the + and - power supplys. That changes
the push pull follower from unity gain to 6db.
he describes a push pull power follower circuite where the output is grounded and
the output is taken from the junction of the + and - power supplys. That changes
the push pull follower from unity gain to 6db.
J. Broskie says about this amp:
"The triodes act as feedback resistors and they set the gain of the amplifier. So, is the gain of this amplifier 33, the mu of the 6DJ8? No, it is closer to 10 because the resistors in the input stage are not bypassed. " -- so near 20 dB.
imho, gain depends on transconductance of chosen Mosfets (and ev. the amount of nfb.)
For a Hafler P4000, page 8 , " in this connection, the output stage ( alone ) has its full voltage gain of typicaly 20 dB ..." but i dont know how to calculate it.
"The triodes act as feedback resistors and they set the gain of the amplifier. So, is the gain of this amplifier 33, the mu of the 6DJ8? No, it is closer to 10 because the resistors in the input stage are not bypassed. " -- so near 20 dB.
imho, gain depends on transconductance of chosen Mosfets (and ev. the amount of nfb.)
For a Hafler P4000, page 8 , " in this connection, the output stage ( alone ) has its full voltage gain of typicaly 20 dB ..." but i dont know how to calculate it.
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