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#10656
Billy
Moderator

Check R11 is definitely a 1K and not a 110R both have the same colour bands read the opposite way

The voltage on IC1B pin 5 is way off it should be around 4.5v coming from VR through R11 all pins except 4 ground and 8 power should be around 4.5v

Some of your PT2399 readings are a little off pin 9 for example with 0v so check C1 solder joints have a good connection

I’d compare the voltages and use the schematic to check those areas where your voltages differ taking into account the difference in power supply,  yours looks like it’s 9.18V

Make sure your PT2399 is firmly secured into it’s socket