Sounds like you're testing things basically the way I was:

http://www.glitchwrks.com/2019/06/05/pdp1110-psu-repair

I used a large Stancor 24 VAC transformer to supply power to the modules, since 
they usually see 20-30 VAC from the big transformer in the chassis.

For dummy loads, I like automotive tail lamp bulbs. Series/parallel as 
necessary to get the load you want. Do keep in mind they get hot enough at 
rated voltage to melt soft plastics.

> I replaced them with a LED and a resistor.

Many of the later modules do that anyway! I used incandescent lamps because I 
had them on hand. Wouldn't you know, after reassembling and a few hours of 
bench running in the PDP-11/10, one of the old ones I hadn't replaced burned 
out too :P

Thanks,
Jonathan

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