Well, I've finally had a little free time again. Dug out my old copy of Millman & Halkias, made some assumptions, did some calculations, and decided that about 7 Henrys @ 50 ma would do the job. Found a Weber 9H choke @125 ma (replacement for a guitar amp) for pretty cheap and plopped it in. Replaced the out of spec resistor at the same time, and its all working a treat again.
Here's what it looks like (sorry for the lousy photo. used my phone since I was too lazy to go upstairs to get my camera)
Paul