Good answer Jim.. There is or there was an offer over here of a very hefty
switch mode and a couple of those would do the trick very nicely, but I don't
want to risk the noise - if I can avoid it. The 9420 blew because of
something I did accidentally so I should fix it ! I do have spare pass
transistors and also some capacitors. And it keeps my feet warm ...
Interesting sideline - the spare pass transistors are from Newark and all from
the same manufacturing batch but they are very far from matched when I test
them.
It may be un-necessary, but I think I'll use a couple that are reasonably
close.
John G3JAG
On Monday 25 February 2008 18:01:15 Jim Brown K9YC wrote:
> On Mon, 25 Feb 2008 17:23:59 +0000, jacrux wrote:
> >If only I could find
> >the time and energy to fix the Herc PSU (again.)
>
> FWIW, the Herc II works quite nicely with a generic 13.8V supply of
> sufficient heft. I use two Astron 70's, with their regulators
> linked. It will take very heavy duty service -- it's been through
> several very agressive Sweepstakes efforts. Others use a smaller P/S
> to float-charge a beefy battery, and if the charger and battery are
> reasonably well matched, they work fine too.
>
> That doesn't mean you shouldn't try to fix your TenTec supply, but
> it also doesn't mean that you shouldn't also use the amp while
> you're waiting to find the time to do it. :)
>
> My Herc II came used without a TenTec supply (the seller sold his
> separately before I got to him), so I've never seen one (or the
> schematic).
>
> 73,
>
> Jim K9YC
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