pre SS performante

[domenico80]

I enclose a pre-line diagram to SS that sounds good, in my opinion.
simple and sophisticated offers and interesting performances
today Q 1, 2, 8, 9 are no longer produced
the problem is input with dual fet which would impose careful selection of single jfet
is possible paralleling two pairs of jfet ?
paralleling two pairs of single fet in input, then I can make a selection less intransigent ?

 

[planet IX]

There is a resistor missing - where does Q3 get its base current from?

 

[domenico80]

originally, instead of Q 3, R 20, 21 and C 2, a TCR 513 was envisaged