[Ron Ramirez]

It would do...but you will achieve more optimal results by using the tube that will actuallly be used in the circuit for neutralizing that circuit. Using the actual tube to be used in that circuit when neutralizing will neutralize as much of THAT particular tube's interelectrode capacitance as possible (interelectrode capacitance within each of the RF amplifier tubes is the reason these sets need to be neutralized in the first place). True, a bit of stray capacitance is introduced by usning the adapter, but the end result is still better than using a tube with a bad filament or one with a filament pin cut off.

Oh, and those neutralizing instructions may be found here:
http://www.philcoradio.com/tech/neutral.htm