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Old 22nd November 2007, 06:09 PM   #1
PRNDL is offline PRNDL  United States
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Default on/off/on switch for bright/bold?

I'm interested in adding a bright/normal/bold switch to my guitar amp, but am unsure of what switch is needed.

The switch would do the following:
Up = bright, connect a bright cap across the volume pot
Middle = normal, no connections (open for both)
Down = bold, connect a .68F cathode bypass cap to the first preamp stage

I'm pretty certain that I'd need one of these DPDT switches

On/Off/On
http://www.mojomusicalsupply.com/ite...797&id=4110505

On/On/On
http://www.mojomusicalsupply.com/ite...797&id=4110510

Does someone have the schematics for both of these?
Which is the correct one for what I want to do?

Thanks!

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Old 22nd November 2007, 08:05 PM   #2
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The on-off-on is the type you want. Keep the switch close to the volume control - will pick up hum.

The on/on/on type is also callled "alternate action" - one of the poles changes state in the middle position, and neither is ever open. These can be wired as a 1 pole 3-way selector if you ever need one.
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Old 22nd November 2007, 08:14 PM   #3
PRNDL is offline PRNDL  United States
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Does an on-off-on work by connecting the center to either the top or bottom lug, and no connection in the middle?
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Old 22nd November 2007, 09:53 PM   #4
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Quote:
Originally posted by PRNDL
Does an on-off-on work by connecting the center to either the top or bottom lug, and no connection in the middle?
Perzakly. An on-off-on is the type I used in a project to switch the cathode current meter between left and right. The center position disconnects the meter completely in case of hum pick-up. So far, that hasn't been a problem, but leaving the meter connected isn't real exciting either since the current doesn't change.
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