Yep, just short pin 1 to pin 3 and pin 4 to pin 5 and you'll be away....
If you get crackes and other nasties, you may have to open the thing up and GENTLY ease the top section out a tad from the bottom one and GENTLY return, thus cleaning the myriad contacts holding the upper and lower sections together...
A total PITA to service (and early ones weren't reliable), but wonderful sounding and an endearing classic IMO.
Tear down these walls; Cut the ties that held me
Crying out at the top of my voice; Tell me now if you can hear me