Guru
Joined: 07/08/2011
Location: AustraliaPosts: 6541
| Posted: 02:19am 18 Jan 2023 |
I have been following this with interest and finally had to get involved.
Can you measure the voltage drop across R24, R23 and R19.
As it stands, it looks like Q8 is not turning on as much as it should. This is allowing the base voltages of Q1 and Q2 to be pulled too negative.
As Phil99 pointed out, the feedback does make life difficult.
Jim