i decided to try bouth input and output transfomers..since vertigo Compressor have on input jensen and api 2500 have transformers on output...
I will try bouth!!!
and will let you know in a week....
for input I used spare studer 1:1 transformers form A80
and for output MCI stancore 1:1 also 600:600 ohm!!!!!
If you need stancore.. my friend have some for sale send me PM and I will give you his mail!!!