Nutube build

[tyerkey]

Hi Everyone, Now that I built an F5 I know everything, right? I have decided to build a Korg Nutube B1. I have the board and nutube, and I am finding the rest of the parts. I am going to build my own chassis. I want to make one or two modifications to the design.

1) I would like to make it less likely to mess up my speakers if somebody turns it on or off with the amp on. Am I correct in believing I would be able to use the soft start board offered on the diyaudio store for that purpose?

2) I want to build it with 3 input channels instead of the 2 that are in the design and build guide. I believe I would have to use a potentiometer with 3 0r 4 channels instead of 2 if I do that change. I am in the planning and part collecting phase of the build. Any help with planning this modification or with reasons for or against it will be helpful to me.

Thanks

 

[Nelson Pass]

Probably smarter to use a muting relay at the output of the Nutube circuits.

 

[dtaylo3]

The volume pot is 2 channel -- left and right. And that is all you will need. You will need one left and right input from your 3-way source selector switch to the pot, and one L & R output from pot to the circuit board. Here's such a switch: Stereo selector switch

 

[tyerkey]

Thanks!

 

[rayma]

I happened to have this schematic, which is one mono channel of your three input stereo circuit.
Double it for stereo. The amplifier represents a phono stage, or it could be just another wire instead.

 

[tyerkey]

Thanks, I needed what you posted.