G1176 stereo link - weird issue with GR meters

[elskardio]

Hi,

I just finished a dual 1176 with the stereo link boards from Hairball Audio.
Both channels work perfectly but when I link them the GR meters are way off!
I triple checked the wiring and everything looks fine.

Here's a video showing the problem. This is with a sinewave at both channels.

https://vid.me/t24T

Any help would be appreciated.
Thanks

 

[RuudNL]

Looks like the FET bias is differently set or that the FETs are not properly matched.

 

[elskardio]

The 4 Fets are from Hairball Audio and they are supposed to be matched.

I'll try to re-calibrate the Bias on both channels.

Thanks

 

[RuudNL]

No idea what the Hairball Stereo Link Boards do. (Don't have a schematic)
But in fact you wouldn't even need this.
If the FETs are properly matched (you will need a matched quad),  it is sufficient to link the 'control points'  for the left and right channel. If needed, just correct the FET bias a little so that both channels track perfectly.

 

[elskardio]

Hi RuudNL,

here's the schematic for the stereo link board.
Basically it sums both sidechain signals.