Here is a snap of same input signal but via balanced input an zero volume. Also just after powering up i took a picture of what the signal looks like justbefore i adjust volumeknob (potentiometer)
So i got OP-amps installed. And sending it full volume on phone true Balanced input and some volume. DBT is out and i see no problems at this point. Is it safe for me to go off DBT and set bias or do i need to do anything else?
Edit: Added the 100pf to C520. And also some stabalizer between pinh 4 nd 8.
Edit: Added the 100pf to C520. And also some stabalizer between pinh 4 nd 8.
Yes it seems like it is working but i still need to adjust bias. This is speaker output the other picture was output from amplifier
Set it based on the voltage across the test points by the output transistors. Do you know what the idle current is supposed to be?
Yes 8mV and from my understanding it needs to be set off DBT? If not I might have set it to high? At this point point I will mount the output transistors to heatsink
Yes, you want to take it off DBT when you set that. Otherwise the reduced supply voltage might mess up your voltage reading.
Maybe ramp up the lightbulb power before you disable the DBT altogether?
Maybe ramp up the lightbulb power before you disable the DBT altogether?