Doepfer

> We have about 100 +5V/2500mA supplies left which we add for free upon
> request to any other order. Details on our website in the Sonderliste
> (special list). But these supplies are suitable only for 230V mains
voltage
> Best wishes
> Dieter Doepfer

There, you see? It's not a big deal. Most of the Doepfer (and Analogue
Systems, and what-have-you) cabinets have plenty of space inside for
5v power supplies. 

Thank you Dieter....

The hobbyist market abounds with cheap supplies.
For example, this one will run heaters for at least 3 tube modules:
http://www.mpja.com/prodinfo.asp?number=17430+PS