PDP8 power supply G8018

[Dwight K. Elvey]

Hi
 He might check out the circuit breaker. These
are know to go bad, especially if they are used
often as a switch or have been tripped often.
 Unless there is a soft start circuit, it is
unlikely that the filter capacitor would trip
the breaker but otherwise continue to work after
the power came up normally.
Dwight


>From: "Wai-Sun Chia" <waisun.chia at gmail.com>
>
>On 4/19/05, Steven_R_Hutchins at raytheon.com
><Steven_R_Hutchins at raytheon.com> wrote:
>> 
>> 
>> I am considering using two modern +5v at 25A switching power supplies to
>> replace  the +5V source ( leaving the original -5V at 2A,+15 at 2A,-15 at 2A,and
>> +20 at 4A as original) in a PDP-8A.
>> My intent is to increase the reliability of the system. I have had trouble
>> with keeping the G8018's operating. I occasionally trip the breakers on
>> startup. I am thinking bad filter Caps. Perhaps someone could give some
>> opinions on this (Crazy) idea.
>
>Hmm....here's a crazy thought..
>What about...replacing the filter caps? :-)
>Or troubleshooting the PSU?
>
>A PDP8 with a SMPS to me is total heresy.
>Where do you stop?
>
>One of the tenets in classic computing (to me anyway) is to retain
>originality as far as possible or as much as your funding/SO permits..
>:-)
>
>/wai-sun
>
>