There are 2
independant 5V outputs on this supply, the logic +5V and the
memory +5V. Which one did you load, and did you check both of them?
I loaded one of the +5V outputs on one of the backplane connectors and
I don't know the 11/24 that well (at least not this version, mine is in
the 5/25" box with the more standard SMPSU). In the 11/44, there's a main
5V supply for the CPU logic, the Unibus cards, etc and a separate +5VB
line (I think that's what it's called) for the memory boards only. I cna
take a look at the prints on bitsaers and see what goes where.
tested every 5V output I could find on the backplane
connectors, they were
all the same voltage. I used a 6V headlamp bulb on the 5W part, so drew
The main 5V output of this supply is rated to supply up to 125A (!). I
think I'd load it a little more heavily than that.
about 1A. I could try again to make doubly sure and
perhaps load one of the
other 5V outputs. Do you know off hand which output is the one for the
memory so I can load that too. I have two 6V bulbs available to me now so I
can load logic and memory if I know which is which. Would you recommend me
using the 21W filament instead? I am not sure how much current the PSU will
supply, but guess 5A should not strain it.
I cna't remmber what the memeory supply can provide, but I'll bet it's
more than 5A. The CPU supply is 125A I think (maybe 120A, it's a lot
anyhow).
These supplys will shut down without damage if you try to draw too much
current from them. So try whatever bulbs you like.
-tony