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May I ask why you chose diamond buffer for output stage? Is it better than for example CFP or EF stage in that position?
And shouldn't some transistor pairs be thermally coupled on the PCB as some driver transistors with output pair in diamond buffer? Thanks.
 
Winston O'Boogie said:
........This will be for my son who's just starting out in recording and a pre with some character would suit what he does....
Then it should be something special.  And you should implement all your Toshiba unobtainium  stuff (2SK146 etc.) in it . :)
Thanks for detailed explanation.
 
Hi Winston,

Can you explain to me how this is Class A? (Or am I missing something? - I noticed the "A" in "Class A" is in quotes in the thread subject)

To my understanding the Diamond Buffer is Class AB but like most typical Class AB output stages can be biased into Class A.
Is that what is going on here?

One other detail I noticed is that Q4 and Q6 are tied to Q14 and Q15 emitters instead of the voltage rails - is that the trick?

Lucas
 

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