DC Offset on Class A headphone amp.

[Dxvideo]

Yes Its swinging between -4 to 0mV while pot is moving.
Is it bad?

 

[AndrewT]

Hi,
only 4mV swing with vol pot adjustment is very good.
Many amps swing as much, or more, just from temperature effects alone.

 

[Dxvideo]

And these are the final situation of the amp... Enclosured and tested..

An externally hosted image should be here but it was not working when we last tested it.

An externally hosted image should be here but it was not working when we last tested it.

An externally hosted image should be here but it was not working when we last tested it.

Not beatifull but works.. The trimpots are from old design. Not connected to anywhere bur I didnot remove..

 

[AndrewT]

How does the heat get out of that plastic box!

 

[Dxvideo]

We will see... I am not sure because I've tested it outside the box until now. May be I will drill some dirty holes upside..