Vintage Synth Repair

so my parts came in today, and i got to soldering. disconnected the
synth, dropped in the new power transistors, double checked my work,
made sure no solder bridged any leads. upon powering up, i hear a
crackling, which i later isolated to what i believe is the
MJE1100(+15V power transistor). on a meter, its jumping all over the
place, from 4V to 12V. neg voltage is essentially mirroring this. 

im assuming i got a bad MJE1100. but seeing as how the part is $30 and
obsolete, it seems like it makes more sense for me to just buy a new
linear +15/-15 PSU and drop it in. but this brings up my original
issue: current draw. the only things i have to go on here are that the
original fuse, and original transformer, were both rated for .5A. now
i would ASSUME that the HAA15-.8-AG, a .8A rated PSU from power-one:

http://www.power-one.com/cgi-bin/acdc_search.cgi?volts_1=15&volts_2=-15&ref=linear&lid=37448&x=80&y=6&LINEAR=f

would be sufficient, but i dont know what the + side vs. - side draw is
of the ARP. furthermore, would going for the next size up, the 1.5A,
make sense, or is there any issue with PSU's seeing a lot less of a
load than they are rated for? thanks alot for any advice, folks.-rj

ps-on the subject of digital power supply replacing the old analog, i
believe these are all analog PSU's. please correct me if im wrong.