[sdiy] MG-1 first mods, VC res

[Harry Bissell Jr]

Is it possib;e that you have a transformer for
Japanese line (like 100V) and you are operating on a
higher line voltage...

Also, are you measuring the AC voltage with the load ?
It can be MUCH higher than the rating in that case.

I'd measure the DC voltage at the regulator input for
the best idea of actual performance.

Remember that heatsinks cost money and manufacturers
will let parts run hot, just not TOO HOT

H^) harry


--- Metrophage <c0r3dump23 at yahoo.com> wrote:

> --- KA4HJH <ka4hjh at gte.net> wrote:
> > According to the parts list in the service manual,
> a *38V*
> > transformer is stock in the MG-1. Are you sure
> you're reading this
> right?
> 
> I don't have the parts list, but I do have the
> schematics. The
> schematics show 29v of raw voltage on either side,
> which is where I got
> the 58vct figure from. Tweaking my lame ghetto
> analog meter as best I
> can, I read it as +/- 27v. This is still a bit much,
> and my meter is
> not terribly accurate. The 27 volts are between the
> regulators input
> pins and ground, same deal with the rectifier
> diodes.
> 
> > The Australian version had a 35V transformer, all
> others used 38V.
> 
> Well, mine certainly didn't! Another discrepancy is
> that some versions
> have a built-in power cord (looks like three prong,
> but is two-prong),
> while others have a receptacle for a standard
> removable IEC cable. Mine
> is the former. Since even the schematics indicate an
> excessive input
> voltage, I doubt very much if this is my mistake
> (for a change!). I can
> only imagine how hot these regulators would be at
> 35v! Even at this 27v
> or so they are too hot to touch.
> 
> I've got my 33vct transformer ready to try today. I
> hope this isn't too
> little! People typically suggest leaving a bit of
> headroom so I'd
> prefer 35v, but I don't have a convenient stash of
> transformers here.
> 
> CJ
> 
> 
> 		
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