dod 260 direct box transformer / reamp mods

[jmasciswannabe]

I was wondering if anyone might know the specs on the transforme that is in the 260 stage hand dod passive direct box. I am wanting to modify it to use it as a reamp box. I know that it is already backwards compatible, but I would like to make it more like the schematic below. In other schems I have looked at r1 is typically a bit over the transformer ratio. In this case 150, r1 is 200 and in another 600 r1 is 680. So I am basically trying to figure out what resistor I should throw in there for R1. Didn't find any info on this site and couldn't find the 260 schem on the net. Any help or suggestions would be appreciated!

peace!
ian

http://www.ionrecords.com/tapeop/ampinterface.jpg

[jmasciswannabe]

bump

[Nikolay]

here is jensen issue about this sch
http://www.jensen-transformers.com/as/as092.pdf

I think that impedance resistor is not necessary