Cascading EQ's with switches

[Matador]

I have two different (tube) EQ's (with different topologies) that I would like to either a) be completely bypassed, b) one or the other in circuit, or c) the first cascading into the second.

Is there any reason the below scheme might not work?




So then we have:

1) Bypassed - SW1 open, SW2 closed, SW3 open, SW4 closed
2) EQ1 only - SW1 closed, SW2 open, SW3 open, SW4 closed
3) EQ2 only - SW1 open, SW2 closed, SW3 closed, SW4 open
4) EQ1 -> EQ2 - SW1 closed, SW2 open, SW3 closed, SW4 open

 

[shabtek]

looks good if eq blocks present hi-Z load that source driving this unit is not affected by

 

[Matador]

looks good if eq blocks present hi-Z load that source driving this unit is not affected by

Good point: in this particular case, both EQ's have a tube grid with a 1MEG pull-down resistor at their input, so yes, both are high Z.

I guess in theory, if one (or both) EQ's presented low-Z inputs that could be impacted by a (high) source R, a third switch could be added to the input to disconnect it's loading effect, at the cost of two more switches, but otherwise everything else stays the same.