10db Level drop around EQ/INS Switch

[tlmaen]

Hi,
I have one Channel where the Level ist down by about 10db if EQ and INS PRE is not activated.
I tracked the problem down to the 82E11 Group Amp Card. When I use a card from another Channel, the Problem is gone.
I just can't get my head around it... I don't find any clues in the Schematic of the 82E11 handling any of the EQ/INS switches/Signal

I removed all of the ICs on the 82E11 until the Signal was gone.
Only T5 and T7 had to be on the Board to pass signal.
I swapped them out, just in case, replaced the only two 100uf Cīs in the Signal path, nothing changes.

The Level is still down and has a few more overtones.
Also the Sinewave on the Scope was not a pure Sine anymore.

The attenuated signal can be traced back to the Input Amp, and to the VCA Card, but they work fine if a Group Amp Card from another channel is in Place.

(Its an very early E Series, and the Group Amp Card has a Sub Board on top for the supercue Function).

Any help is much appreciated!

Thanks,
Tilmann

[Dave Dicson]

I'd replace all the caps, especially if they are orange. Make sure nothing has eaten any of traces.

[tlmaen]

Thanks, definitely will do that and see if this is the problem.
My Console is so old, it has almost no electrolytic caps in it, all tantalum Cīs
There were a few orange ones, I replaced most of it.

[Dave Dicson]

Replace the tantalum caps also. They have a habit of shorting. Later versions of the SSL's didn't use them. Good luck.

[tlmaen]

Completely recapped the Card, that fixed the Problem!
Thanks Dave for pointing out the obvious...
Wasted a few hours to find it.

Next time if a card has a fault or problem, I will recap them first.

Thanks,
Tilmann