Jonte Knif
Well-known member
Basically you just replace all transistors in the ladder with vari-mu tubes, and of course I use a tube differential+feedback amp there too. By modulating ladder current from ca 10uA to 10mA I get a wide f range and there is a lot of feedback gain and non linearities available to put the beast into freak mode (as you can hear). Current generator is a solid state affair, no need to use tubes there. And expo converter is totally modern thingy with nice DIP package THAT transistor arrays and temperature compensation.
If you understand how the transistor version works, this is one of the easiest topologies to tubefy, as weird as it may seem. Just perspirate and you will eventually get there.
But still, sorry, as long as I even think about commercializing the thing I can not share the actual schematic. Perhaps later. I will try to choose some module that I could publish in order to show some respect to DIYers here.
-Jonte
If you understand how the transistor version works, this is one of the easiest topologies to tubefy, as weird as it may seem. Just perspirate and you will eventually get there.
But still, sorry, as long as I even think about commercializing the thing I can not share the actual schematic. Perhaps later. I will try to choose some module that I could publish in order to show some respect to DIYers here.
-Jonte