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Mini Pass Labs B1 Korg preamp.

Wardsweb

Wardsweb

Renaissance man
My latest build is based on a Nelson Pass design found on the DIYAudio forums. Even though it doesn't look like it, this is a tube preamplifier. What looks like a glass IC is actually a Korg Nutube 6P1 Dual Triode. I purchased the PCB and NuTube from DIYAudioStore. The chassis is from China.

B1Korg01.jpgB1Korg02.jpg It runs on 29vdc. Fun little build and sounds nice.
 
That's cool, never seen a "tube" like that. What's with all the resistors around the knob? Is that some sort of "stepped" control, rather than the usual continuous pot?
 
PaulyT said:
That's cool, never seen a "tube" like that. What's with all the resistors around the knob? Is that some sort of "stepped" control, rather than the usual continuous pot?
Click to expand...

Yes, the volume control is a stepped ladder attenuator. It was something I had laying around and tried. I have ordered a 50K Alps blue velvet pot to use in its place. The mechanical switching in this cheap ladder is too noisey for my liking.
 
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