C-64 PSU

A question..

Since I have now quite a bunch of stuff sticking long way out of my EXPANSION port and also some from the tape port - I am thinking to eventually replacing my 30 years old and still reliable PSU. I have the one with two fuses and a power switch, which is quite rare and I wouldn't like to make it fail as it seems to get running quite hot with everything attached. Now - what's the problem you may ask. The problem and question is always the 9VAC. ALthough all the PSUs are rated at 9VAC, I recall that they supply somewhere between 11V and 12V. Moreover I recall that back in the days, when I supplied a "true" 9V of AC some things didn't work properly on the 64. I don't remember today what was failing but I remember that delivering a proper 9V didn't work out. Does anyone know why:

a) why PSUs rated as 9V (have to) deliver 11+
b) if they have to deliver more then why?
c) whether using a DC/AC converter like http://www.ide64.org/stuff.html this one there has any noticeable effect (has anyone tried it)?

Regards,

-- 
SD!


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