Follow-up,
I ordered a set of 10 Motorola MC1723CP which cross reference to the
stock LM723CN the Astron uses, on Ebay, for all of $5.25 shipped from
this seller:
http://tinyurl.com/ozwdjhr
This was indeed the resolution to my PS issue and it's running
perfectly now. No telling why the regulator went south but thanks for
the replies!
73,
Gary
KA1J
> Gentlemen,
>
> Thank you all so much for the replies regarding upgrades, suggestions
> and green wire dealings with my two Astron power supplies. The only
> reason I asked that here was the mention of the green neutral being
> left in a floating condition on at least some of the Astron PS. I
> need to repair the one that is Kaput and am looking around for a
> LM723 around here as the links mention that to be a common culprit,
> I've used them before in several projects and probably have several
> gathering dust in an old Radio Shack package. If not, I see them
> listed quite inexpensively on ebay and will pick up several for
> future issues I may encounter.
>
> The four 2N3771 transistors really do run hot on the VS-35M, can't
> say I touched them on the RS-35M but surely they are the same, the
> circuit between the two PS are very similar. I'm assuming I can use
> any off the shelf 2N3771 & the .05 5W wirewounds will balance them
> fairly. On the PS I made some years back I used 3055's and I have
> several of them unused, would these be more rugged or should I stick
> with the 3771 as it comes with?
>
> Mention was made of Arctic Silver; I have some Arctic Silver 5 & some
> of their Ceramique which I too used in overclocking computers. I can
> certainly remove & replace the heat sink compound with this, not a
> big job and using it did lower my core temps on the computer
> processor.
>
> I really appreciate the links and help.
>
> Thanks & 73,
>
> Gary
> KA1J
>
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