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.
I can't go on and I can't go back, I don't feel so matter of fact,
I tried and tried to make good sense, What's the good to try it all again?