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From: prindle@NADC.ARPA (Frank Prindle)
Newsgroups: comp.sys.cbm
Subject: Re: C64 power supply
Message-ID: 
Date: 25 Sep 89 13:28:27 GMT
Sender: prindle@NADC.ARPA (Frank Prindle)
Lines: 15

A transformer can really only fail one way - a winding opens up, usually from
excessive heat melting solder at some point where wires are joined. Oxidation
and a cold solder joint eventually cause the winding to open. Of course, if
you dead short the thing, it can also melt the wire itself depending on the
rating of the transformer.

A C64 transformer actually has two independent windings, and you'll not likely
find one exactly like it. Replace it with one 6V, 2A transformer (for the
5VDC supply) and one 9 to 12V, 2A transformer (for the isolated 9VAC supply).
Older C64s draw about 1 Amp from each of the 5VDC and 9VAC supplies, while
newer ones draw more from the 5VDC supply and less from the 9VAC supply.

Sincerely,
Frank Prindle
Prindle@NADC.arpa