I powered the Variax 700 thru the VDI and plug into the amp via the 1/4" jacks and it works...Thanks for the tip.
I could be that the doide is broken, because I measured the power and notices that only after the diode the power is gone...
My Variax 700 is not producing any sound when I connect it thru the1/4"plug, I checked the batteries they are ok with 9.5 volts...If I use my variax 700 hru VDI it works. What else could be the problem?