The Kuartlotron - keantoken's simple error-correction superbuffer

May I ask a favor.... I intend to use the single-ended version of the Kuartlotron as an input buffer for a hybrid amp.
You posted such a version waaaay back on this thread.
Here is my input, should have 19v on upper rail.
As near as I can tell, Iq should be about 10mA, but I'm not sure.
Would you care to take a look, see if there are any glaring errors?
Or suggestions for improvement?

Thanks in advance.

Sheldon
 

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Report my build. I use pcb by Project16. Q1, q3 are bc559 veb=0.706v. Q2 and q4 are bc549 vbe=0.722v.

According to formula, r1=r2=70e, I use 68e for r1 (r13 in pcb) and r2.

In this pcb R9 is set by trim pot+r12. R12 is fixed at 2700k and trim pot is short.
c3 18pf

Offset is below 2-4mv for both channels, no need to adjust trim pot for r9.

20230403_091557.jpg
 
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