I'm trying to fix channel 2 on my scope. I've replaced one component that shorted to -12, which seems to have killed the next component

The part I need is NEC uPA61A. It's a N-Channel Silicon JFET differential Amplifier. But I can't find any old ones for sale, in fact even getting any reference to it at all is a pain.
Here's a link to the datasheet:
http://www.datasheetlib.com/datasheet/737497/upa60_nec-electronics.htmlA modern equivalent would be just as good.
Help would be very much appreciated.
Thanks.