It would be possible to add an EQ in/out switch, but there may be problems with levels.
The top of the channel fader is fed by a 100uF cap. Switching the input of that from the output of the input amplifier should do the job, but I would advise against it because of probably unforseen level and stability problems.
If anyone asks me to carry out that mod, the answer would be no!
I also own a 828 MK1 mixer, and I would love to have an useful ON/OFF switch for the EQ section like Whoops asked.
I can see that in your new 828 mixer the MK3 that is based on the MK1 circuitry , you included a really useful ON/OFF switch for the EQ section.
Although you advised in the past of not performing this mod on an MK1, you probably found a clever way of including the ON/OFF switch without incurring into the “Level and Stability” problems you mentioned before.
I would like to ask you if you please could help me out on how could I modify my MK1 to include an On/OFF switch in the EQ as it’s implemented on the MK3 mixer?
Thank you so much for your work Ted and for all your Kind help