Very nice piece of kit. The build instructions are very good. Testing using the test points T1-T8 is very easy. Trimming the pots takes a steady hand to hit 9.50V. I have not experienced any microphonics in my build. I use it to get a “tube”-like sound filter on my existing system.
I put the Nutube in between the preamp and two mono power amps and inverted the speaker cables on one speaker (as Nelson suggests).
I like the sound but it is very warm compared to the sound without it, but certainly very pleasant to my ears.
I am considering modifying Input 2 to be a bypass. That way I will be able to add the “tube”-like sound with a flick of a switch.
Very well done guys certainly worth the wait!
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