what can I make with these JFETs? (house part number, model unknown)

[maertz13]

So I've found myself with a buttload of these pulled out of an old electric organ.

Appears to be National Semiconductor: 065 (break) 00 (break) 711

I'm not versed enough in JFET specs to know what this compares to or where I can use it, I generally just use the JFET I'm told to use . What might these be good for?

thanks