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09-11-2019, 01:09 AM
Hi Noel
You could simply use a single pole to select the output of stage-1 or stage-2 to feed int stage-3. It is best not to have the output of stage-2 tied to the input of stage-3 all the time if stage-2 is supposed to be optional.
As a refinement of course, when the output of stage-1 is selected, it would in fact be the output of the Clean volume control that is selected wired as a standard level control.
An alternative is to use all shunt switching and re-arrange the attenuations so that the shunt effect contributes a part of it. The Clean volume would be fed by a resistance from the stage-1 coupling cap in parallel with the feed to the Drive control via its resistor. The output of the Clean control would feed to stage-3's grid via a series resistance as would the output of stage-2. The shunt points would be the input or output of the Clean control, the input to the Drive control and the output of stage-2. A DPDT would be needed
Have fun
You could simply use a single pole to select the output of stage-1 or stage-2 to feed int stage-3. It is best not to have the output of stage-2 tied to the input of stage-3 all the time if stage-2 is supposed to be optional.
As a refinement of course, when the output of stage-1 is selected, it would in fact be the output of the Clean volume control that is selected wired as a standard level control.
An alternative is to use all shunt switching and re-arrange the attenuations so that the shunt effect contributes a part of it. The Clean volume would be fed by a resistance from the stage-1 coupling cap in parallel with the feed to the Drive control via its resistor. The output of the Clean control would feed to stage-3's grid via a series resistance as would the output of stage-2. The shunt points would be the input or output of the Clean control, the input to the Drive control and the output of stage-2. A DPDT would be needed
Have fun
