As long as you are happy with having to plug a signal into each input to get a response, no, you don't need any switched connection on the jacks. As that is how a NAND works, you should be fine.
The only possible reason to use a switched jack to positive (via a 1k resistor) would be if you wanted it to work as an inverter when you have only one signal patched into it.
Or, you could disconnect the 100k pulldown on each input from 0V, and connect them to 15V instead. No switched jacks would be needed that way.
Ken
The only possible reason to use a switched jack to positive (via a 1k resistor) would be if you wanted it to work as an inverter when you have only one signal patched into it.
Or, you could disconnect the 100k pulldown on each input from 0V, and connect them to 15V instead. No switched jacks would be needed that way.
Ken