As a former power supply engineer I will weigh in here, all the while
watching my back for daggers!
:-)
In general, PSU designers do NOT underrate components enough, IMNSHO.
This is why so many power supplies dies early, untimely deaths. The
capacitors in particular, tend to bake. If higher temperature caps can
be found, so much the better. In general, going up a little in voltage
rating on caps is OK, SOMETIMES going up in value is OK too, depends
on the design. The idea all around is that heavier is GENERALLY
better. You don't want to go extremely high on capacitor voltages:
they are happiest on a diet of 50% or so of their nominal ratings.
The power transistors can sometimes benefit from having higher
voltage, power and current ratings, as long as everything else (gain
especially) is the same. Personally I like rectifiers rated at at
least double, if not triple, the PEAK voltage in the circuit. Again,
rating for higher temperature handling rarely hurts.
If the supply in question lasted a long time with no problems, there
is no fault to be placed on using exact replacements either. My own
take is to be conservative by going for heavier parts if the costs are
not excessive.
Just my 50 cents...
db
--
David 'db' Butler
AV Wizard, Audio Guru & Team Leader delivering exceptional
on-time & under-budget results with cutting edge technologies.
Quoting Mike Thompson <[email protected]>:
I have a question regarding parts replacement -
i have a tech who has looked at my Series 1E power supply and told
me he could rebuild it with no problem, but I wanted to make sure
before I handed it off to him if there were any parts that needed to
be specific values (equal to or greater), anything that should
specifically be improved upon when rebuilding, how to make it
compliant to the standard, or any other tips to make sure I get the
most out of it. I know some of you guys had rebuilt them and I
figured this was the best place to ask. Let me know.
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