BHSE cannot adjust bias

[Donald123]

For my BHSE, I have changed the original Mullard EL34 tubes to another brand. But the sound of my left side became a bit, how should I say, veiled. The higher the volume and the higher the pitch, the more obvious, like playing songs by soprano.

This still happens after I have changed back to the original Mullard tubes. Has anyone experienced this before or know the reason?

I have discovered that the bias the bottom left tube (left offset) cannot be adjusted. Has anyone experienced this before? Or does anyone know how to fix the problem?

Thanks a lot

 

[steve jones]

Contact Justin at Headamp.