Analogue systems

Folks,

Does anyone know if it is possible to get a bigger power supply for an older
RS15 Chassis?  Mine doesn't have enough power for my modules.  [Remove a
largish module (e.g. RS-110) and it runs fine; put it back and the chassis
will run for a bit but then it will generate a loud low noise at the outputs
of some of the modules and the LEDs visibly change state.]  

I've played around with different module arrangements but without any
current draw information on the modules, this is a guessing game!  Note: It
would be *really good* to have this information on the web site like other
modular manufacturers do!

Any pointers are welcome.

	Eric