I have lately been experimenting with tubes and finally came up with this, it's for synthesizers and bass guitar mostly. I did not have a chance to test it with audio yet, but test with a sine generator and a scope looked promising.
the tube works alright down to 12V and even produces a square with the plate supply off, but since I am equipped with transformers for this, I decided to use how much I have(larger voltages give more control over the amount of clipping as well)
(http://i.imgur.com/iGNthHRl.jpg) (http://i.imgur.com/iGNthHR.jpg)