The Multi Amp aka Dynalo Mk2
This one has been brewing for a while now but since I wanted to build a nice balanced amp it moved up in line. Basic setup is the same as the old Dynalo but now with Super Symmetry input, higher rail voltages and naturally a bit more power. Input stage changed to THAT340 which is a quad bipolar transistor array with matched NPN and PNP pairs. It is cheap and easy to source so no jfet drama. The other transistors are new as well and the pinout is different to reflect that.
Here is a lo
There are a number of parts to the complete preamp/everything solution.
One is this
http://gilmore.chem.northwestern.edu/baseboardbal3.jpg
(low res for now)
Which is the balanced input switch board. For unbalanced you use
the neutrik rca to xlr converters.
Next is the unbalanced/balanced to balanced converter
http://gilmore.chem.northwestern.edu/ubaltobal2.jpg
although there is a new rev of this board. you build it with the
jfets because the that340 has significant bias cur
